fixed environment argument (#43)

Author: wachterjohannes

src/Executor/ExecutionProcessFactory.php

@@ -40,7 +40,7 @@ public function __construct($consolePath, $environment)
     public function create($uuid)
     {
         return $process = ProcessBuilder::create(
-            [$this->consolePath, 'task:execute', $uuid, '-e ' . $this->environment]
+            [$this->consolePath, 'task:execute', $uuid, '--env=' . $this->environment]
         )->getProcess();
     }
 }