* 5.0:
[Routing] fix tests
[DI] minor cleanup
[Form] group constraints when calling the validator
Remove wrong @group legacy annotations
[DependencyInjection] Fix dumping multiple deprecated aliases
allow button names to start with uppercase letter
Allow PHP ^7.2.5
States that the HttpClient provides a Http Async implementation
[Routing] Fix ContainerLoader and ObjectLoaderTest
[HttpKernel] Make ErrorListener::onKernelException()'s dispatcher argument explicit
[HttpKernel] Drop deprecated ExceptionListener
Removed extra whitespace
[Security] Fix best encoder not wired using migrate_from
