Improve method signature compatibility.

- Fixes PHP 7.2 support.

module/VuFind/src/VuFind/ServiceManager/LowerCaseServiceNameTrait.php

@@ -43,13 +43,14 @@ trait LowerCaseServiceNameTrait
     /**
      * Retrieve a plugin
      *
-     * @param string $name Name of plugin
+     * @param string     $name    Name of plugin
+     * @param null|array $options Options to use when creating the instance.
      *
      * @return mixed
      */
-    public function get($name)
+    public function get($name, array $options = null)
     {
-        return parent::get($this->getNormalizedServiceName($name));
+        return parent::get($this->getNormalizedServiceName($name), $options);
     }
 
     /**