Merge pull request #23 from spiral/feature/rr-mode-centrifuge

Adds centrifuge mode

Author: butschster

src/Environment/Mode.php

@@ -40,4 +40,9 @@ interface Mode
      * @var string
      */
     public const MODE_TCP = 'tcp';
+
+    /**
+     * @var string
+     */
+    public const MODE_CENTRIFUGE = 'centrifuge';
 }