Add type hints

Author: adamtheturtle

tests/test_exceptions/test_request_quota_reached.py

@@ -3,7 +3,7 @@
 """
 
 
-def test_request_quota_reached():
+def test_request_quota_reached() -> None:
     # See https://github.com/adamtheturtle/vws-python/issues/822 for writing
     # this test.
     pass