initialized .nickcurrent with .nick

fixes empty return of Nick() directly after initialising

irc.go

@@ -402,6 +402,7 @@ func IRC(nick, user string) *Connection {
 
 	irc := &Connection{
 		nick:        nick,
+		nickcurrent: nick,
 		user:        user,
 		Log:         log.New(os.Stdout, "", log.LstdFlags),
 		end:         make(chan struct{}),