Add support for Python up to 3.7 and PyPy 7.1

Author: Kroisse

.travis.yml

@@ -7,6 +7,15 @@ matrix:
   - os: linux
     language: python
     python: pypy-5.4
+  - os: linux
+    language: python
+    python: pypy-5.10
+  - os: linux
+    language: python
+    python: pypy-6.0
+  - os: linux
+    language: python
+    python: pypy-7.1
   - os: linux
     language: python
     python: 2.7
@@ -19,13 +28,16 @@ matrix:
   - os: linux
     language: python
     python: 3.6
+  - os: linux
+    language: python
+    python: 3.7
 install:
   |
   if [[ "$TRAVIS_OS_NAME" = "linux" ]]; then
     pip install --upgrade pip setuptools tox-travis;
   elif [[ "$TRAVIS_OS_NAME" = "osx" ]]; then
     brew tap drolando/homebrew-deadsnakes;
-    brew install python34 python35 python3 pypy
+    brew install python34 python35 python36 python3 pypy
     pip install --upgrade pip setuptools
     pip install --user tox;
   fi

setup.py

@@ -70,6 +70,7 @@ def readme():
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: System :: Systems Administration :: Authentication/Directory',  # noqa: E501

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = pypy, py27, py34, py35, py36
+envlist = pypy, py27, py34, py35, py36, py37
 minversion = 1.6.0
 
 [testenv]