v1.2.0

feature #1 Update various parts (sstok)

This PR was merged into the master branch.

Discussion
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|Q            |A  |
|---          |---|
|Bug Fix?     |yes|
|New Feature? |yes|
|BC Breaks?   |yes|
|Deprecations?|no |
|Fixed Tickets|   |
|License      |MIT|

Drop support for OEL Symfony versions, use PSR-4, update travis build matrix, and correct CS

Commits
-------

f50d691001e40e8c82991ca54f7f22a367023707 Update to PSR-4
849d70a4154209c9fc360e379bf4fba63a51c5a2 Update travis testing matrix
c9b6357314da0b7f9e802d0d63861cfcc052827e Update gush configuration and correct CS
96d61631058ca6d9dcd1029467285071a704d20b Update travis testing matrix

v1.1.1

style: update headers, and add .gush.yml