Bump version to 0.2a0

Author: jhgg

setup.py

@@ -11,7 +11,7 @@
 
 setup(
     name='graphql-epoxy',
-    version='0.1a1',
+    version='0.2a0',
     description='GraphQL implementation for Python',
     url='https://github.com/graphql-python/graphql-core',
     download_url='https://github.com/graphql-python/graphql-core/releases',