Update README.md

Author: arnaud-lb

README.md

@@ -227,7 +227,7 @@ https://arnaud-lb.github.io/php-rdkafka/phpdoc/book.rdkafka.html
 
 ## Asking for Help
 
-If the documentation is not enough, feel free to ask a questions on the php-rdkafka channels on [Gitter](https://gitter.im/arnaud-lb/php-rdkafka) or [Google Groups](https://groups.google.com/forum/#!groupsettings/php-rdkafka-users/advanced).
+If the documentation is not enough, feel free to ask a questions on the php-rdkafka channels on [Gitter](https://gitter.im/arnaud-lb/php-rdkafka) or [Google Groups](https://groups.google.com/forum/#!forum/php-rdkafka).
 
 ## Stubs