Support Python 3.7 and PyPy3

Author: johnthagen

.travis.yml

@@ -12,8 +12,14 @@ matrix:
           env: TOXENV=py35
         - python: 3.6
           env: TOXENV=py36
+        - python: 3.7
+          env: TOXENV=py37
+          dist: xenial
+          sudo: true
         - python: pypy
           env: TOXENV=pypy
+        - python: pypy3
+          env: TOXENV=pypy3
 
 install:
     - pip install tox

setup.py

@@ -33,6 +33,7 @@
         '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 :: Software Development :: Libraries :: Python Modules',

tox.ini

@@ -6,7 +6,9 @@ envlist =
     py34
     py35
     py36
+    py37
     pypy
+    pypy3
 
 [flake8]
 max-line-length = 99