Allow slash in vhost name odolbeau#37

src/Bab/RabbitMq/VhostManager.php

@@ -18,10 +18,7 @@ class VhostManager
     public function __construct(array $credentials, Action $action, HttpClient $httpClient)
     {
         $this->credentials = $credentials;
-        if ('/' === $this->credentials['vhost']) {
-            $this->credentials['vhost'] = '%2f';
-        }
-
+        $this->credentials['vhost'] = str_replace('/', '%2F', $this->credentials['vhost']);
         $this->action = $action;
         $this->action->setVhost($this->credentials['vhost']);
         $this->httpClient = $httpClient;