Fix request in TwitchBot.delete() method

bot.py

@@ -86,7 +86,7 @@ class TwitchBot(irc.bot.SingleServerIRCBot):
         return r.json()
 
     def delete(self, id):
-        r = requests.post('{0}/quote/{1}'.format(self.api_url, id),
+        r = requests.delete('{0}/quote/{1}'.format(self.api_url, id),
                             headers={'X-Quotes-API-Key': self.api_key})
         r.raise_for_status()
         return r.json()