Command handler method raises exception when command has an argument

[toracle]

bothub sdk supports command handler with on_{command} named method.

When command has an argument, Bot.on_command(self, event, context) raises an exception because it's called with command arguments. It should be Bot.on_command(self, event, context, arg1, arg2, ...). But it's easy to make a mistake to omit following arg1, arg2, ... argument.

User would avoid an exception when declare method like this for quick-and-dirty workaround: Bot.on_command(self, event, context, *args)

I think it's better that dispatcher calls command handler without following command arguments.