Issue title: problem cocorico installation
 Issue body: Hi, 
when i want install cocorico, i have this problem : [screenshot image](https://i.postimg.cc/Qt0Z6p2w/Screenshot-2019-4-24-Symfony-Configuration-Checker.png).
Do you say why ?


thank you in advance.
| Q                | A
| ---------------- | -----
| Bug report?      | [ ]
| Feature request? | [ ]
| Support request? | [ ]

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 Comments: 
 Comment 0: Hi,

It seems that your config.php file is not interpreted by PHP. Could you ensure that your have PHP enabled? 
 Comment 1: We close it as it seems there is no more activity on it. Feel free to reopen it if needed.
{'source': 'GithubIssues', 'repo_name_with_owner': 'Cocolabs-SAS/cocorico', 'issue_id': 443557103, 'repo_stars': 892.0}