diff --git a/Pipfile.lock b/Pipfile.lock
index 057a876..be2791a 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -18,35 +18,34 @@
     "default": {
         "numpy": {
             "hashes": [
-                "sha256:13af0184177469192d80db9bd02619f6fa8b922f9f327e077d6f2a6acb1ce1c0",
-                "sha256:26a45798ca2a4e168d00de75d4a524abf5907949231512f372b217ede3429e98",
-                "sha256:26f509450db547e4dfa3ec739419b31edad646d21fb8d0ed0734188b35ff6b27",
-                "sha256:30a59fb41bb6b8c465ab50d60a1b298d1cd7b85274e71f38af5a75d6c475d2d2",
-                "sha256:33c623ef9ca5e19e05991f127c1be5aeb1ab5cdf30cb1c5cf3960752e58b599b",
-                "sha256:356f96c9fbec59974a592452ab6a036cd6f180822a60b529a975c9467fcd5f23",
-                "sha256:3c40c827d36c6d1c3cf413694d7dc843d50997ebffbc7c87d888a203ed6403a7",
-                "sha256:4d054f013a1983551254e2379385e359884e5af105e3efe00418977d02f634a7",
-                "sha256:63d971bb211ad3ca37b2adecdd5365f40f3b741a455beecba70fd0dde8b2a4cb",
-                "sha256:658624a11f6e1c252b2cd170d94bf28c8f9410acab9f2fd4369e11e1cd4e1aaf",
-                "sha256:76766cc80d6128750075378d3bb7812cf146415bd29b588616f72c943c00d598",
-                "sha256:7b57f26e5e6ee2f14f960db46bd58ffdca25ca06dd997729b1b179fddd35f5a3",
-                "sha256:7b852817800eb02e109ae4a9cef2beda8dd50d98b76b6cfb7b5c0099d27b52d4",
-                "sha256:8cde829f14bd38f6da7b2954be0f2837043e8b8d7a9110ec5e318ae6bf706610",
-                "sha256:a2e3a39f43f0ce95204beb8fe0831199542ccab1e0c6e486a0b4947256215632",
-                "sha256:a86c962e211f37edd61d6e11bb4df7eddc4a519a38a856e20a6498c319efa6b0",
-                "sha256:a8705c5073fe3fcc297fb8e0b31aa794e05af6a329e81b7ca4ffecab7f2b95ef",
-                "sha256:b6aaeadf1e4866ca0fdf7bb4eed25e521ae21a7947c59f78154b24fc7abbe1dd",
-                "sha256:be62aeff8f2f054eff7725f502f6228298891fd648dc2630e03e44bf63e8cee0",
-                "sha256:c2edbb783c841e36ca0fa159f0ae97a88ce8137fb3a6cd82eae77349ba4b607b",
-                "sha256:cbe326f6d364375a8e5a8ccb7e9cd73f4b2f6dc3b2ed205633a0db8243e2a96a",
-                "sha256:d34fbb98ad0d6b563b95de852a284074514331e6b9da0a9fc894fb1cdae7a79e",
-                "sha256:d97a86937cf9970453c3b62abb55a6475f173347b4cde7f8dcdb48c8e1b9952d",
-                "sha256:dd53d7c4a69e766e4900f29db5872f5824a06827d594427cf1a4aa542818b796",
-                "sha256:df1889701e2dfd8ba4dc9b1a010f0a60950077fb5242bb92c8b5c7f1a6f2668a",
-                "sha256:fa1fe75b4a9e18b66ae7f0b122543c42debcf800aaafa0212aaff3ad273c2596"
-            ],
-            "markers": "python_version >= '3.6'",
-            "version": "==1.19.0"
+                "sha256:04c7d4ebc5ff93d9822075ddb1751ff392a4375e5885299445fcebf877f179d5",
+                "sha256:0bfd85053d1e9f60234f28f63d4a5147ada7f432943c113a11afcf3e65d9d4c8",
+                "sha256:0c66da1d202c52051625e55a249da35b31f65a81cb56e4c69af0dfb8fb0125bf",
+                "sha256:0d310730e1e793527065ad7dde736197b705d0e4c9999775f212b03c44a8484c",
+                "sha256:1669ec8e42f169ff715a904c9b2105b6640f3f2a4c4c2cb4920ae8b2785dac65",
+                "sha256:2117536e968abb7357d34d754e3733b0d7113d4c9f1d921f21a3d96dec5ff716",
+                "sha256:3733640466733441295b0d6d3dcbf8e1ffa7e897d4d82903169529fd3386919a",
+                "sha256:4339741994c775396e1a274dba3609c69ab0f16056c1077f18979bec2a2c2e6e",
+                "sha256:51ee93e1fac3fe08ef54ff1c7f329db64d8a9c5557e6c8e908be9497ac76374b",
+                "sha256:54045b198aebf41bf6bf4088012777c1d11703bf74461d70cd350c0af2182e45",
+                "sha256:58d66a6b3b55178a1f8a5fe98df26ace76260a70de694d99577ddeab7eaa9a9d",
+                "sha256:59f3d687faea7a4f7f93bd9665e5b102f32f3fa28514f15b126f099b7997203d",
+                "sha256:62139af94728d22350a571b7c82795b9d59be77fc162414ada6c8b6a10ef5d02",
+                "sha256:7118f0a9f2f617f921ec7d278d981244ba83c85eea197be7c5a4f84af80a9c3c",
+                "sha256:7c6646314291d8f5ea900a7ea9c4261f834b5b62159ba2abe3836f4fa6705526",
+                "sha256:967c92435f0b3ba37a4257c48b8715b76741410467e2bdb1097e8391fccfae15",
+                "sha256:9a3001248b9231ed73894c773142658bab914645261275f675d86c290c37f66d",
+                "sha256:aba1d5daf1144b956bc87ffb87966791f5e9f3e1f6fab3d7f581db1f5b598f7a",
+                "sha256:addaa551b298052c16885fc70408d3848d4e2e7352de4e7a1e13e691abc734c1",
+                "sha256:b594f76771bc7fc8a044c5ba303427ee67c17a09b36e1fa32bde82f5c419d17a",
+                "sha256:c35a01777f81e7333bcf276b605f39c872e28295441c265cd0c860f4b40148c1",
+                "sha256:cebd4f4e64cfe87f2039e4725781f6326a61f095bc77b3716502bed812b385a9",
+                "sha256:d526fa58ae4aead839161535d59ea9565863bb0b0bdb3cc63214613fb16aced4",
+                "sha256:d7ac33585e1f09e7345aa902c281bd777fdb792432d27fca857f39b70e5dd31c",
+                "sha256:e6ddbdc5113628f15de7e4911c02aed74a4ccff531842c583e5032f6e5a179bd",
+                "sha256:eb25c381d168daf351147713f49c626030dcff7a393d5caa62515d415a6071d8"
+            ],
+            "version": "==1.19.2"
         },
         "pandas": {
             "hashes": [
@@ -75,7 +74,6 @@
                 "sha256:73ebfe9dbf22e832286dafa60473e4cd239f8592f699aa5adaf10050e6e1823c",
                 "sha256:75bb3f31ea686f1197762692a9ee6a7550b59fc6ca3a1f4b5d7e32fb98e2da2a"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.8.1"
         },
         "pytz": {
@@ -90,7 +88,6 @@
                 "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
                 "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==1.15.0"
         }
     },
@@ -111,18 +108,16 @@
         },
         "attrs": {
             "hashes": [
-                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
-                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
+                "sha256:26b54ddbbb9ee1d34d5d3668dd37d6cf74990ab23c828c2888dccdceee395594",
+                "sha256:fce7fc47dfc976152e82d53ff92fa0407700c21acd20886a13777a0d20e655dc"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==19.3.0"
+            "version": "==20.2.0"
         },
         "babel": {
             "hashes": [
                 "sha256:1aac2ae2d0d8ea368fa90906567f5c08463d98ade155c0c4bfedd6a0f7160e38",
                 "sha256:d670ea0b10f8b723672d3a6abeb87b565b244da220d76b4dba1b66269ec152d4"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.8.0"
         },
         "black": {
@@ -135,11 +130,10 @@
         },
         "bleach": {
             "hashes": [
-                "sha256:2bce3d8fab545a6528c8fa5d9f9ae8ebc85a56da365c7f85180bfe96a35ef22f",
-                "sha256:3c4c520fdb9db59ef139915a5db79f8b51bc2a7257ea0389f30c846883430a4b"
+                "sha256:52b5919b81842b1854196eaae5ca29679a2f2e378905c346d3ca8227c2c66080",
+                "sha256:9f8ccbeb6183c6e6cddea37592dfb0167485c1e3b13b3363bc325aa8bda3adbd"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
-            "version": "==3.1.5"
+            "version": "==3.2.1"
         },
         "certifi": {
             "hashes": [
@@ -150,36 +144,44 @@
         },
         "cffi": {
             "hashes": [
-                "sha256:001bf3242a1bb04d985d63e138230802c6c8d4db3668fb545fb5005ddf5bb5ff",
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-                "sha256:62ae9af2d069ea2698bf536dcfe1e4eed9090211dbaafeeedf5cb6c41b352f66",
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-                "sha256:95cd16d3dee553f882540c1ffe331d085c9e629499ceadfbda4d4fde635f4b7d",
-                "sha256:99f748a7e71ff382613b4e1acc0ac83bf7ad167fb3802e35e90d9763daba4d78",
-                "sha256:b8c78301cefcf5fd914aad35d3c04c2b21ce8629b5e4f4e45ae6812e461910fa",
-                "sha256:c420917b188a5582a56d8b93bdd8e0f6eca08c84ff623a4c16e809152cd35793",
-                "sha256:c43866529f2f06fe0edc6246eb4faa34f03fe88b64a0a9a942561c8e22f4b71f",
-                "sha256:cab50b8c2250b46fe738c77dbd25ce017d5e6fb35d3407606e7a4180656a5a6a",
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-                "sha256:f2b0fa0c01d8a0c7483afd9f31d7ecf2d71760ca24499c8697aeb5ca37dc090c"
-            ],
-            "version": "==1.14.0"
+                "sha256:005f2bfe11b6745d726dbb07ace4d53f057de66e336ff92d61b8c7e9c8f4777d",
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+                "sha256:3363e77a6176afb8823b6e06db78c46dbc4c7813b00a41300a4873b6ba63b171",
+                "sha256:33c6cdc071ba5cd6d96769c8969a0531be2d08c2628a0143a10a7dcffa9719ca",
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+                "sha256:4d7c26bfc1ea9f92084a1d75e11999e97b62d63128bcc90c3624d07813c52808",
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+                "sha256:cb763ceceae04803adcc4e2d80d611ef201c73da32d8f2722e9d0ab0c7f10768",
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+                "sha256:d80998ed59176e8cba74028762fbd9b9153b9afc71ea118e63bbf5d4d0f9552b",
+                "sha256:de31b5164d44ef4943db155b3e8e17929707cac1e5bd2f363e67a56e3af4af6e",
+                "sha256:e66399cf0fc07de4dce4f588fc25bfe84a6d1285cc544e67987d22663393926d",
+                "sha256:f0620511387790860b249b9241c2f13c3a80e21a73e0b861a2df24e9d6f56730",
+                "sha256:f4eae045e6ab2bb54ca279733fe4eb85f1effda392666308250714e01907f394",
+                "sha256:f92cdecb618e5fa4658aeb97d5eb3d2f47aa94ac6477c6daf0f306c5a3b9e6b1",
+                "sha256:f92f789e4f9241cd262ad7a555ca2c648a98178a953af117ef7fad46aa1d5591"
+            ],
+            "version": "==1.14.3"
         },
         "chardet": {
             "hashes": [
@@ -193,16 +195,14 @@
                 "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a",
                 "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
             "version": "==7.1.2"
         },
         "colorama": {
             "hashes": [
-                "sha256:7d73d2a99753107a36ac6b455ee49046802e59d9d076ef8e47b61499fa29afff",
-                "sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1"
+                "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b",
+                "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
-            "version": "==0.4.3"
+            "version": "==0.4.4"
         },
         "coverage": {
             "hashes": [
@@ -243,35 +243,37 @@
         },
         "cryptography": {
             "hashes": [
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@@ -293,7 +295,6 @@
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@@ -301,7 +302,6 @@
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@@ -324,16 +324,14 @@
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@@ -371,7 +369,6 @@
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@@ -383,15 +380,15 @@
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@@ -401,7 +398,6 @@
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@@ -413,17 +409,16 @@
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@@ -431,7 +426,6 @@
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@@ -439,7 +433,6 @@
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@@ -447,7 +440,6 @@
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@@ -463,7 +455,6 @@
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@@ -472,18 +463,16 @@
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@@ -511,43 +500,48 @@
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@@ -577,7 +571,6 @@
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@@ -600,7 +593,6 @@
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@@ -608,7 +600,6 @@
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         "sphinxcontrib-htmlhelp": {
@@ -616,7 +607,6 @@
                 "sha256:3c0bc24a2c41e340ac37c85ced6dafc879ab485c095b1d65d2461ac2f7cca86f",
                 "sha256:e8f5bb7e31b2dbb25b9cc435c8ab7a79787ebf7f906155729338f3156d93659b"
             ],
-            "markers": "python_version >= '3.5'",
             "version": "==1.0.3"
         },
         "sphinxcontrib-jsmath": {
@@ -624,7 +614,6 @@
                 "sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178",
                 "sha256:a9925e4a4587247ed2191a22df5f6970656cb8ca2bd6284309578f2153e0c4b8"
             ],
-            "markers": "python_version >= '3.5'",
             "version": "==1.0.1"
         },
         "sphinxcontrib-qthelp": {
@@ -632,7 +621,6 @@
                 "sha256:4c33767ee058b70dba89a6fc5c1892c0d57a54be67ddd3e7875a18d14cba5a72",
                 "sha256:bd9fc24bcb748a8d51fd4ecaade681350aa63009a347a8c14e637895444dfab6"
             ],
-            "markers": "python_version >= '3.5'",
             "version": "==1.0.3"
         },
         "sphinxcontrib-serializinghtml": {
@@ -640,7 +628,6 @@
                 "sha256:eaa0eccc86e982a9b939b2b82d12cc5d013385ba5eadcc7e4fed23f4405f77bc",
                 "sha256:f242a81d423f59617a8e5cf16f5d4d74e28ee9a66f9e5b637a18082991db5a9a"
             ],
-            "markers": "python_version >= '3.5'",
             "version": "==1.1.4"
         },
         "toml": {
@@ -652,11 +639,10 @@
         },
         "tqdm": {
             "hashes": [
-                "sha256:63ef7a6d3eb39f80d6b36e4867566b3d8e5f1fe3d6cb50c5e9ede2b3198ba7b7",
-                "sha256:7810e627bcf9d983a99d9ff8a0c09674400fd2927eddabeadf153c14a2ec8656"
+                "sha256:9ad44aaf0fc3697c06f6e05c7cf025dd66bc7bcb7613c66d85f4464c47ac8fad",
+                "sha256:ef54779f1c09f346b2b5a8e5c61f96fbcb639929e640e59f8cf810794f406432"
             ],
-            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==4.47.0"
+            "version": "==4.51.0"
         },
         "twine": {
             "hashes": [
@@ -670,9 +656,11 @@
             "hashes": [
                 "sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355",
                 "sha256:0c2c07682d61a629b68433afb159376e24e5b2fd4641d35424e462169c0a7919",
+                "sha256:0d8110d78a5736e16e26213114a38ca35cb15b6515d535413b090bd50951556d",
                 "sha256:249862707802d40f7f29f6e1aad8d84b5aa9e44552d2cc17384b209f091276aa",
                 "sha256:24995c843eb0ad11a4527b026b4dde3da70e1f2d8806c99b7b4a7cf491612652",
                 "sha256:269151951236b0f9a6f04015a9004084a5ab0d5f19b57de779f908621e7d8b75",
+                "sha256:3742b32cf1c6ef124d57f95be609c473d7ec4c14d0090e5a5e05a15269fb4d0c",
                 "sha256:4083861b0aa07990b619bd7ddc365eb7fa4b817e99cf5f8d9cf21a42780f6e01",
                 "sha256:498b0f36cc7054c1fead3d7fc59d2150f4d5c6c56ba7fb150c013fbc683a8d2d",
                 "sha256:4e3e5da80ccbebfff202a67bf900d081906c358ccc3d5e3c8aea42fdfdfd51c1",
@@ -681,12 +669,16 @@
                 "sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3",
                 "sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b",
                 "sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614",
+                "sha256:92c325624e304ebf0e025d1224b77dd4e6393f18aab8d829b5b7e04afe9b7a2c",
                 "sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb",
+                "sha256:b52ccf7cfe4ce2a1064b18594381bccf4179c2ecf7f513134ec2f993dd4ab395",
                 "sha256:bcd3b13b56ea479b3650b82cabd6b5343a625b0ced5429e4ccad28a8973f301b",
                 "sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41",
                 "sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6",
                 "sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34",
                 "sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe",
+                "sha256:d648b8e3bf2fe648745c8ffcee3db3ff903d0817a01a12dd6a6ea7a8f4889072",
+                "sha256:fac11badff8313e23717f3dada86a15389d0708275bddf766cca67a84ead3e91",
                 "sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4",
                 "sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7"
             ],
@@ -694,11 +686,10 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527",
-                "sha256:88206b0eb87e6d677d424843ac5209e3fb9d0190d0ee169599165ec25e9d9115"
+                "sha256:8d7eaa5a82a1cac232164990f04874c594c9453ec55eef02eab885aa02fc17a2",
+                "sha256:f5321fbe4bf3fefa0efd0bfe7fb14e90909eb62a48ccda331726b4319897dd5e"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'",
-            "version": "==1.25.9"
+            "version": "==1.25.11"
         },
         "versioneer": {
             "hashes": [
diff --git a/requirements.txt b/requirements.txt
index 3deed25..a93dc0d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
--i https://pypi.org/simple
-numpy==1.19.0; python_version >= '3.6'
+-i https://pypi.org/simple/
+numpy==1.19.2
 pandas==1.0.5
-python-dateutil==2.8.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+python-dateutil==2.8.1
 pytz==2020.1
-six==1.15.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+six==1.15.0