Merge pull request #24 from cloudstateio/fix/startup

fix for Issue #23 "start shopping_cart.py on local development"

Author: sleipnir

google/api/annotations_pb2.py

@@ -25,6 +25,7 @@ install_requires =
     grpcio == 1.28.1
     grpcio-tools == 1.28.1
     attrs == 19.3.0
+    googleapis-common-protos >= 1.51.0
 
 [aliases]
 test=pytest

google/api/annotations_pb2_grpc.py

@@ -4,4 +4,4 @@
 
 if __name__ == '__main__':
     logging.basicConfig()
-    CloudState().register_event_sourced_entity(shopping_cart_entity).serve()
+    CloudState().register_event_sourced_entity(shopping_cart_entity).start()