Fix typo in the docstring (python-telegram-bot#878)

Simon Schürrle · tsnoam · commit bb5357a81588 · 2017-10-18T22:00:17.000+03:00
Changed `Filters.status_update.new_chat_member` to `Filters.status_update.new_chat_members` Thanks to @ajbvn for pointing it out. [ci skip]
diff --git a/telegram/ext/filters.py b/telegram/ext/filters.py
@@ -265,7 +265,7 @@ class _StatusUpdate(BaseFilter):
         """Subset for messages containing a status update.
 
         Examples:
-            Use these filters like: ``Filters.status_update.new_chat_member`` etc. Or use just
+            Use these filters like: ``Filters.status_update.new_chat_members`` etc. Or use just
             ``Filters.status_update`` for all status update messages.
 
         """
