Update laravel version to 5

The repo mentions laravel 5 while this page was still mentioning laravel 4

see https://github.com/dockerwest/php-laravel

Author: jnstr

project-specific-images/index.html

@@ -115,7 +115,7 @@ <h3>PHP</h3>
         <td><a href="https://github.com/dockerwest/php-laravel" target="_blank">php-laravel</a></td>
         <td>dockerwest/php</td>
         <td>5.6, 7.0, 7.1 and 7.2</td>
-        <td>PHP container for Laravel 4 applications with all basic required extensions.</td>
+        <td>PHP container for Laravel 5 applications with all basic required extensions.</td>
     </tr>
     <tr>
         <td><a href="https://github.com/dockerwest/php-symfony" target="_blank">php-symfony</a></td>