Revert "Change composer require for Zmq pusher"

This reverts commit 404244a.

Author: prophet777

Resources/docs/Pusher.md

@@ -21,7 +21,7 @@ sudo php5enmod zmq
 You will need to install a new dependency through composer:
 
 ```cmd
-composer require gos/react-amqp
+composer require react/zmq
 ```
 
 Then reload php-fpm server or apache/nginx if you are not using php-fpm