Set mypy implicit_reexport = False

This setting is useful for better controlling imports and exports in
public APIs.

Author: bluetech

setup.cfg

@@ -39,7 +39,7 @@ disallow_subclassing_any = True
 disallow_untyped_calls = True
 # disallow_untyped_decorators = True
 disallow_untyped_defs = True
-; implicit_reexport = False
+implicit_reexport = False
 no_implicit_optional = True
 strict_equality = True
 strict_optional = True