commit messages could use some love

[colemickens]

if I'm reading the update script correctly, it's going to keep writing firefox-nightly-bin: a -> a updates, for example, if there was a new beta published without a nightly being published.

the commit message only reflect firefox-nightly-bin, doesn't capture updates to other packages, etc.

Pretty low on my overall global list right now, but wanted to file to keep track.