edit release notes per remarks by @fgeorgatos in #245
also mention last minute included PR #251
Merge branch 'v1.4.0.x' of github.com:hpcugent/easybuild-easyconfigs into v1.4.0.x
Merge pull request #249 from boegel/v1.4.0.x

edit release notes per remarks by @fgeorgatos in #245