Promote 2.4 as the default Redis server profile.

lib/Predis/Profiles/ServerProfile.php

@@ -31,7 +31,7 @@ abstract class ServerProfile implements IServerProfile, IProcessingSupport {
             '2.0'     => '\Predis\Profiles\ServerVersion20',
             '2.2'     => '\Predis\Profiles\ServerVersion22',
             '2.4'     => '\Predis\Profiles\ServerVersion24',
-            'default' => '\Predis\Profiles\ServerVersion22',
+            'default' => '\Predis\Profiles\ServerVersion24',
             'dev'     => '\Predis\Profiles\ServerVersionNext',
         );
     }