Add EnumMeta.__reversed__ just in case someone does this.

I sure hope not.

discord/enums.py

@@ -97,6 +97,9 @@ class EnumMeta(type):
     def __iter__(cls):
         return (cls._enum_member_map_[name] for name in cls._enum_member_names_)
 
+    def __reversed__(cls):
+        return (cls._enum_member_map_[name] for name in reversed(cls._enum_member_names_))
+
     def __len__(cls):
         return len(cls._enum_member_names_)