Added getConfig() method

Author: Geolim4

src/phpFastCache/Cache/ExtendedCacheItemPoolInterface.php

@@ -25,6 +25,11 @@
  */
 interface ExtendedCacheItemPoolInterface extends CacheItemPoolInterface
 {
+    /**
+     * @return array
+     */
+    public function getConfig();
+
     /**
      * [phpFastCache phpDoc Override]
      * Returns a Cache Item representing the specified key.