Update for v2.6.0

Author: oschwald

src/WebService/Client.php

@@ -47,7 +47,7 @@ class Client implements ProviderInterface
     private $client;
     private static $basePath = '/geoip/v2.1';
 
-    const VERSION = 'v2.5.0';
+    const VERSION = 'v2.6.0';
 
     /**
      * Constructor.