Include full commit message in "automatic-releases"

[electrovir]

It seems that release message generated via the automatic-releases package only include the title (first line) of each commit message. I would normally look to a release change log to find detailed information about the change in each release. However, this since git practices dictate a commit message first line of no more than 50 characters, the release change logs produced by automatic-releases end up not being very detailed at all.