Prepare for 1.3.1 (schmittjoh#396)

Release (schmittjoh#388)

* prepare for 1.3.0 release

* syntax updates

Merge pull request schmittjoh#357 from NobletSolutions/release-1.2.3

Updated changelog prior to release

Merge pull request schmittjoh#337 from Nyholm/changelog

Updated changelog prior release.

Merge pull request schmittjoh#315 from Nyholm/release

Prepare for release 1.2.1

Merge pull request schmittjoh#286 from artursvonda/patch-1

Fix FileWriter::write signature

allows more Symfony versions

fixed version constant