feature/host-overrides (#161)

* configurable host overrides

* base host overrides on name of service instead of key and hide the options by default

* added unit tests

* review changes

* Refactor options

* Refactor

* Update Readme

* Pump version and update Changelog

Co-authored-by: Tobias Jacksteit <me@xtj7.de>

CHANGELOG.md

@@ -5,6 +5,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.5.0] - 2020-06-15
+
+### Added
+
+- Allow to override hosts for Jira, Youtrack and Gitlab in options (implemented by yay-digital.de)
+
+## [1.4.0] - 2020-04-27
+
+### Added
+
+- Add support for Gitlab merge requests and issues
+
 ## [1.3.4] - 2020-01-09
 
 ### Added