Bump node-sass from 4.7.2 to 4.9.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.7.2 to 4.9.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v4.7.2...v4.9.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

package.json

@@ -90,7 +90,7 @@
     "mime": "^2.3.1",
     "mongoose": "~4.13.2",
     "multer": "~1.3.0",
-    "node-sass": "~4.7.2",
+    "node-sass": "~4.9.0",
     "nyc": "^12.0.2",
     "quill-url-embeds": "^1.2.5",
     "raven": "~2.6.1",

yarn.lock

@@ -1205,11 +1205,11 @@ create-error-class@^3.0.0:
   dependencies:
     capture-stack-trace "^1.0.0"
 
-cross-env@^5.1.5:
-  version "5.1.5"
-  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-5.1.5.tgz#31daf7f3a52ef337c8ddda585f08175cce5d1fa5"
+cross-env@^5.2.0:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-5.2.0.tgz#6ecd4c015d5773e614039ee529076669b9d126f2"
   dependencies:
-    cross-spawn "^5.1.0"
+    cross-spawn "^6.0.5"
     is-windows "^1.0.0"
 
 cross-spawn@^3.0.0:
@@ -1234,6 +1234,16 @@ cross-spawn@^5.0.1, cross-spawn@^5.1.0:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
+cross-spawn@^6.0.5:
+  version "6.0.5"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-6.0.5.tgz#4a5ec7c64dfae22c3a14124dbacdee846d80cbc4"
+  dependencies:
+    nice-try "^1.0.4"
+    path-key "^2.0.1"
+    semver "^5.5.0"
+    shebang-command "^1.2.0"
+    which "^1.2.9"
+
 crypt@~0.0.1:
   version "0.0.2"
   resolved "https://registry.yarnpkg.com/crypt/-/crypt-0.0.2.tgz#88d7ff7ec0dfb86f713dc87bbb42d044d3e6c41b"
@@ -3826,11 +3836,7 @@ mute-stream@0.0.7:
   version "0.0.7"
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.7.tgz#3075ce93bc21b8fab43e1bc4da7e8115ed1e7bab"
 
-nan@^2.3.2:
-  version "2.8.0"
-  resolved "https://registry.yarnpkg.com/nan/-/nan-2.8.0.tgz#ed715f3fe9de02b57a5e6252d90a96675e1f085a"
-
-nan@^2.9.2:
+nan@^2.10.0, nan@^2.9.2:
   version "2.10.0"
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.10.0.tgz#96d0cd610ebd58d4b4de9cc0c6828cda99c7548f"
 
@@ -3882,6 +3888,10 @@ negotiator@0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.1.tgz#2b327184e8992101177b28563fb5e7102acd0ca9"
 
+nice-try@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.4.tgz#d93962f6c52f2c1558c0fbda6d512819f1efe1c4"
+
 nocache@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/nocache/-/nocache-2.0.0.tgz#202b48021a0c4cbde2df80de15a17443c8b43980"
@@ -3919,9 +3929,9 @@ node-pre-gyp@^0.9.0:
     semver "^5.3.0"
     tar "^4"
 
-node-sass@~4.7.2:
-  version "4.7.2"
-  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.7.2.tgz#9366778ba1469eb01438a9e8592f4262bcb6794e"
+node-sass@~4.9.0:
+  version "4.9.0"
+  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.9.0.tgz#d1b8aa855d98ed684d6848db929a20771cc2ae52"
   dependencies:
     async-foreach "^0.1.3"
     chalk "^1.1.1"
@@ -3935,7 +3945,7 @@ node-sass@~4.7.2:
     lodash.mergewith "^4.6.0"
     meow "^3.7.0"
     mkdirp "^0.5.1"
-    nan "^2.3.2"
+    nan "^2.10.0"
     node-gyp "^3.3.1"
     npmlog "^4.0.0"
     request "~2.79.0"
@@ -4284,7 +4294,7 @@ path-is-inside@^1.0.1, path-is-inside@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/path-is-inside/-/path-is-inside-1.0.2.tgz#365417dede44430d1c11af61027facf074bdfc53"
 
-path-key@^2.0.0:
+path-key@^2.0.0, path-key@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/path-key/-/path-key-2.0.1.tgz#411cadb574c5a140d3a4b1910d40d80cc9f40b40"