Fix for PHP Warning #2

Fix for PHP Warning:  Declaration of action_plugin_googlefonts::register(&$controller) should be compatible with DokuWiki_Action_Plugin::register(Doku_Event_Handler $controller) in /home/***/public_html/lib/plugins/googlefonts/action.php on line 72

action.php

@@ -16,7 +16,7 @@
 class action_plugin_googlefonts extends DokuWiki_Action_Plugin {
 
     // register hook
-    function register(&$controller) {
+    function register(Doku_Event_Handler $controller) {
         $controller->register_hook('TPL_METAHEADER_OUTPUT','BEFORE', $this, '_addFontCode');
     }