c3935e7 Fix validator method answer by @robwasripped
589a2a4 && f26823e Fix Minor typo & update security.yml by @ismail1432
164e8c5 && 324dab8 && d7fa7a9 && 60d1d9c && 6f63483 && aa95831 Minor typo / syntax / grammar by @evertharmeling
Thanks to all contributors, this version is compatible with Symfony 2 to Symfony 4 versions of the framework certification.