Update symfony dependencies

What's Changed

• Update symfony dependecies by @Asisyas in #4

Full Changelog: v1.6.1.1...1.6.3

v2.0.0-alpha1

Update v2.x-automation-test for micro/plugin-locator

2.0.0-alpha

Release notes for 2.0.0-alpha

v2.x-automation-test

Release notes for v2.x-automation-test

v1.6.1.1 bugfix

What's Changed

• v1.6.1.1 [bugfix] double located files by @Asisyas in #3

Full Changelog: v1.6.1...v1.6.1.1

v1.6.1

Merge pull request #2 from Micro-PHP/1.6.1

WIP: v1.6.1

v1.0 release

Merge pull request #1 from Micro-PHP/release-1.0

v1.0 release