Fixed bot may respond to the bot

Author: eunwoo1104

dico_command/bot.py

@@ -76,6 +76,8 @@ async def verify_prefix(self, message: dico.Message):
                 return final_prefixes[i]
 
     async def execute_handler(self, message: dico.Message):
+        if message.author.bot:
+            return
         cont = message.content
         if not cont:
             return