Merge branch '2.8' into 3.3

* 2.8:
  PHP CS Fixer: clean up repo and adjust config
  Dumper shouldn't use html format for phpdbg
  [Validator] Fix access to root object when using composite constraint

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2014-present Fabien Potencier
+Copyright (c) 2014-2018 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal