title: Laravel config/app.php not updating
body: <p>in laravel 5 , config/app.php I've set the locale to 'ar'
  but while trying to get locale in code via:
   <code>config('app.locale');</code> </p>
  
  <p>I still get 'en'.
  Seems like config/app.php isn't auto-loaded/updated.</p>
  
  <p>even if config/app.php is empty, executing<code>config('app');</code> returns:</p>
  
  <pre><code>array:10 [▼
  "debug" =&gt; true
  "url" =&gt; "http://localhost"
  "timezone" =&gt; "UTC"
  "locale" =&gt; "en"
  "fallback_locale" =&gt; "en"
  "key" =&gt; "XXXXXXXXXXXXXXXXXXXXXXX" // changed here
  "cipher" =&gt; "AES-256-CBC"
  "log" =&gt; "single"
  "providers" =&gt; array:31 [▶]
  "aliases" =&gt; array:36 [▶]]
  </code></pre>
  
  <p>Some hint will be appreciated.</p>