Support for Symfony 5

[GwendolenLynch]

This is probably going to need a few changes based on feedback. I just thought I'd get it all together & testable first.

~There are two related upstream PRs for SymfonyTest https://github.com/SymfonyTest/SymfonyDependencyInjectionTest/pull/121 and https://github.com/SymfonyTest/SymfonyConfigTest/pull/63 to make the DI test package work.~

~That is where part of the version bump(s) come in. The package has a BC break in signatures after v3, and v4 requires PHPUnit 8 for TestCase compatibility.~

So please let me know what more is wanted, or not, and I'll happily work to get this over the line :smiley_cat:

Summary

• Drop PHP < 7.1 ~7.2~
• Drop Symfony < 4.3 ~4.0~
• Deprecations for HttpKernel Events
• Drop matthiasnoback/symfony-dependency-injection-test
• ~Update Travis to use PHPUnit 8.3~
• Remove syntaxCheck from phpunit.xml
• Signature updates

[fabpot]

As this bundle is used by API Platform... ans because I want to write a chapter on API Platform in my upcoming Symfony book... that should be finished really soon now, I would appreciate a version of this bundle that supports Symfony 5 :)

[GwendolenLynch]

@nicolas-grekas I've pushed a change that drops the test library & bumps PHP requirements on Travis down to 7.1 :tada:

[Seldaek]

Seems fine to me, all good to merge then or did you wanna do more @GawainLynch ?

[GwendolenLynch]

I'd say :shipit:, thank you @Seldaek :+1:

[Seldaek]

Thank you for the work