Fix coding standard and add conflict explanation

Author: loic425

CONFLICTS.md

@@ -2,3 +2,8 @@
 
 This document explains why certain conflicts were added to `composer.json` and
 references related issues.
+
+- `willdurand/hateoas-bundle: ^2.6`
+
+This version allows Symfony 7 but does not support the "annotation_reader" service removal.
+@see https://github.com/willdurand/BazingaHateoasBundle/issues/108