Add temporary error send in dev cog

jarvis/cogs/dev.py

@@ -300,6 +300,10 @@ class DevCog(commands.Cog):
 
         del args, code
 
+    @commands.Cog.listener()
+    async def on_command_error(self, ctx, error):
+        await ctx.send(str(error))
+
 
 def setup(bot):
     bot.add_cog(DevCog(bot))