Enable release notes feature for Derek
Enable release notes feature for Derek

This feature enables notes to be collected from all merged/closed
PRs since the last release. The notes are then set/saved on the
release body field.
alexellis/faas,alexellis/faas,rgee0/faas,alexellis/faas,rgee0/faas,rgee0/faas,rgee0/faas,alexellis/faas,rgee0/faas,openfaas/faas,alexellis/faas,rgee0/faas,alexellis/faas,alexellis/faas,rgee0/faas,openfaas/faas,rgee0/faas,openfaas/faas,rgee0/faas,alexellis/faas,rgee0/faas,alexellis/faas