fix addMinutes to Carbon 3

src/Claims/Factory.php

@@ -199,7 +199,7 @@ public function setRequest(Request $request)
      */
     public function setTTL($ttl)
     {
-        $this->ttl = $ttl;
+        $this->ttl = $ttl ? (int) $ttl : $ttl;
 
         return $this;
     }