add return type to get_project

Author: attila-papai

labelbox/client.py

@@ -427,7 +427,7 @@ def _get_single(self, db_object_type, uid):
         else:
             return db_object_type(self, res)
 
-    def get_project(self, project_id):
+    def get_project(self, project_id) -> Project:
         """ Gets a single Project with the given ID.
 
         >>> project = client.get_project("<project_id>")