Update dependency for Symfony 4.#4

Merged

Nyholm merged 11 commits intophp-http:masterfrom

dbrumann:update/symfony4

Nov 29, 2017

Commits on Oct 22, 2017

Update dependency for Symfony 4.
Denis Brumann
committed
Add Symfony 4 to travis build matrix.
Denis Brumann
committed

Commits on Nov 24, 2017

Add dev flag to Symfony 4 build.
Denis Brumann
committed

Commits on Nov 25, 2017

Adding dev-flag should not be necessary as composer.json allows for dev-stability.
Denis Brumann
committed

Commits on Nov 27, 2017

Restructure .travis.yml
Denis Brumann
committed
Add SYMFONY_VERSION to build allowed failed.
Denis Brumann
committed
Remove unused exclude and refine requirement for 3.x LTS.
Denis Brumann
committed
Add missing Symfony version.
Denis Brumann
committed
Separate matrix sections with comments.
Denis Brumann
committed

Commits on Nov 29, 2017