Updates for GrumPHP 2.3 support

v0.1.4

Fix issues for latest GrumPHP version

Use GrumPHP 2.3

v0.1.3

Bump GrumPHP to latest version

Only run if the gitlab-ci.yml file has changed

v0.1.2

Only run if .gitlab-ci.yml has been modified

Allow customising Gitlab instance URL

This release adds support for on-premises Gitlab installations.

First release

v0.1.0

Initial commit