Update utility.py

added new competing bot-presence to the help list

Author: lorenzo132

cogs/utility.py

@@ -506,6 +506,7 @@ async def activity(self, ctx, activity_type: str.lower, *, message: str = ""):
             - `streaming`
             - `listening`
             - `watching`
+            - `competing`
 
         When activity type is set to `listening`,
         it must be followed by a "to": "listening to..."