Prepare patch release that supports Python 3.8

Author: Cito

Diff for: setup.py

@@ -23,7 +23,7 @@ def run_tests(self):
 
 setup(
     name='graphql-relay',
-    version='2.0.0',
+    version='2.0.1',
 
     description='Relay implementation for Python',
     long_description=open('README.md').read(),
@@ -48,6 +48,7 @@ def run_tests(self):
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: Implementation :: PyPy',
     ],
 

Diff for: tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{27,34,35,36,37,py,py3}, flake8, manifest
+envlist = py{27,34,35,36,37,38,py,py3}, flake8, manifest
 
 [testenv:flake8]
 basepython = python3.7