Adds non-official note

Author: moay

README.md

@@ -4,12 +4,9 @@
 
 A self hosted server for Symfony Flex allowing private recipes, customized recipes and caching functionality for the official endpoints.
 
-![ui](https://user-images.githubusercontent.com/3605512/36627099-eb239f48-193d-11e8-919a-d98003696d7b.png)
-
-## Early stage
+#### This is not an official project by SensioLabs or the Symfony core team.
 
-The server is basically ready to be used and is used in production, but there might still be some quirks. Any report on new issues is welcome. Thanks!
-___
+![ui](https://user-images.githubusercontent.com/3605512/36627099-eb239f48-193d-11e8-919a-d98003696d7b.png)
 
 ### Features