Pass objects on command.execute

Pass objects instead of using a switch statement.
Now I don't have to restart the bot whenever I add a new command
that needs specific arguments other than 'message'.

commands/say.js

@@ -1,7 +1,7 @@
 module.exports = {
 	name: 'say',
 	description: 'Repeats arguments',
-	execute(message, args) {
+	execute({message, args}) {
 
 		if(args.length == 0)
 			message.channel.send("Can't send empty message");