Prepare release

github.user.js

 // ==UserScript==
 // @name        Toggl-Button GitHub
 // @namespace   https://gitlab.paragon-es.de/toggl-button
-// @version     1.4
+// @version     1.5
 // @include     http*://github.com/*/*/issues/*
 // @include     http*://github.com/*/*/poll/*
 // @include     http*://github.com/*/*/issues/new