BUGFIX: Allow replacement of method

* As this method should be replaces by concrete classes.

Relates: #7

src/Standards/Typo3Update/Sniffs/LegacyClassnames/ClassnameCheckerTrait.php

@@ -162,7 +162,7 @@ trait ClassnameCheckerTrait
      * @param string $classname
      * @return string
      */
-    private function getTokenForReplacement($classname)
+    protected function getTokenForReplacement($classname)
     {
         return $classname;
     }