Fix lint issue

Author: esrakartalOpt

optimizely/project_config.py

@@ -40,9 +40,11 @@
 RESERVED_ATTRIBUTE_PREFIX: Final = '$opt_'
 
 EntityClass = TypeVar('EntityClass')
+
 class Region(str, enums):
     US = 'US'
     EU = 'EU'
+
 class ProjectConfig:
     """ Representation of the Optimizely project config. """