Changed max-line-length for black

Author: syrusakbary

setup.cfg

@@ -1,6 +1,6 @@
 [flake8]
 exclude = tests,scripts,setup.py,docs,graphql/execution/executors/asyncio_utils.py,conftest.py
-max-line-length = 200
+max-line-length = 160
 
 [coverage:run]
 omit=graphql/backend/quiver_cloud.py,tests,*/tests/*