Implement type/union suppression

Pipfile

@@ -39,7 +39,7 @@ sphinx = ">=1.8,<2"
 [packages]  # Make sure to keep in sync with setup.py requirements.
 arrow = ">=0.15.0,<1"
 funcy = ">=1.7.3,<2"
-graphql-core = ">=3.1,<3.2"  # minor versions sometimes contain breaking changes
+graphql-core = ">=3.1.2,<3.2"  # minor versions sometimes contain breaking changes
 pytz = ">=2017.2"
 six = ">=1.10.0"
 sqlalchemy = ">=1.3.0,<2"