Restore php 5.3 syntax.

Author: greg-1-anderson

src/Plugin.php

@@ -38,14 +38,14 @@ public function activate(Composer $composer, IOInterface $io)
      */
     public static function getSubscribedEvents()
     {
-        return [
+        return array(
             PackageEvents::PRE_PACKAGE_INSTALL => 'prePackage',
             PackageEvents::POST_PACKAGE_INSTALL => 'postPackage',
             PackageEvents::PRE_PACKAGE_UPDATE => 'prePackage',
             PackageEvents::POST_PACKAGE_UPDATE => 'postPackage',
             PackageEvents::PRE_PACKAGE_UNINSTALL => 'prePackage',
             PackageEvents::POST_PACKAGE_UNINSTALL => 'postPackage',
-        ];
+        );
     }
 
     /**