ActivityHandler inheriting from Bot (microsoft#1443)

Co-authored-by: tracyboehrer <tracyboehrer@users.noreply.github.com>

Author: axelsrz

libraries/botbuilder-core/botbuilder/core/activity_handler.py

@@ -12,6 +12,7 @@
  HealthCheckResponse,
 )
 
+from .bot import Bot
 from .bot_adapter import BotAdapter
 from .healthcheck import HealthCheck
 from .serializer_helper import serializer_helper
@@ -20,7 +21,7 @@
 from .turn_context import TurnContext
 
 
-class ActivityHandler:
+class ActivityHandler(Bot):
  """
  Handles activities and should be subclassed.
 
@@ -30,7 +31,9 @@ class ActivityHandler:
  in the derived class.
  """
 
- async def on_turn(self, turn_context: TurnContext):
+ async def on_turn(
+ self, turn_context: TurnContext
+ ): # pylint: disable=arguments-differ
  """
  Called by the adapter (for example, :class:`BotFrameworkAdapter`) at runtime
  in order to process an inbound :class:`botbuilder.schema.Activity`.