Support PyPy

.travis.yml

@@ -3,6 +3,9 @@ python:
   - "2.7"
   - "3.6"
   - "3.7-dev"
+  # Test PyPy versions because PyPy is awesome :)
+  - "pypy2.7"
+  - "pypy3.6"
 
 matrix:
     allow_failures:

setup.py

@@ -98,6 +98,7 @@ setup(
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: Implementation',
         'Programming Language :: Python :: Implementation :: CPython',
+        'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Software Development :: Libraries :: Python Modules'
     ),
     cmdclass={

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27, py34, py35, py36
+envlist = py27, pypy, py34, py35, py36, pypy3
 
 [testenv]
 deps = pipenv