Add drivers to CacheManager::getStaticSystemDrivers()

Author: hammermaps

src/phpFastCache/CacheManager.php

@@ -237,6 +237,8 @@ public static function getStaticSystemDrivers()
           'Leveldb',
           'Wincache',
           'Xcache',
+          'Zenddisk',
+          'Zendshm',
           'Devnull',
         ];
     }