Update comments in teams_helper (#531)

* change comments

* black fix

Author: Eric Dahlvang

libraries/botbuilder-core/botbuilder/core/teams/teams_activity_handler.py

@@ -412,7 +412,6 @@ async def on_teams_members_removed_dispatch(  # pylint: disable=unused-argument
     ):
         teams_members_removed = []
         for member in members_removed:
-            # TODO: fix this
             new_account_json = member.serialize()
             if "additional_properties" in new_account_json:
                 del new_account_json["additional_properties"]

libraries/botbuilder-core/botbuilder/core/teams/teams_helper.py

@@ -10,6 +10,9 @@
 import botbuilder.schema as schema
 import botbuilder.schema.teams as teams_schema
 
+# Optimization: The dependencies dictionary could be cached here,
+# and shared between the two methods.
+
 
 def deserializer_helper(msrest_cls: Type[Model], dict_to_deserialize: dict) -> Model:
     dependencies = [
@@ -27,9 +30,6 @@ def deserializer_helper(msrest_cls: Type[Model], dict_to_deserialize: dict) -> M
     return deserializer(msrest_cls.__name__, dict_to_deserialize)
 
 
-# TODO consolidate these two methods
-
-
 def serializer_helper(object_to_serialize: Model) -> dict:
     if object_to_serialize is None:
         return None