Bump Version to 2.5.1

Author: LKaemmerling

src/HetznerAPIClient.php

@@ -27,7 +27,7 @@ class HetznerAPIClient
     /**
      * Version of the API Client.
      */
-    const VERSION = '2.5.0';
+    const VERSION = '2.5.1';
 
     const MAX_ENTITIES_PER_PAGE = 50;