I (and others) are upset at Ruby's normally great messaging being totally absent here. As a lay user of Ruby, I have no idea what changed in this release.
Well, they did say "TEENY" so I just take it as "nothing changed, some bugs were fixed, etc". They also link to the list of commits, and looking at that list you can see a lot of bug fixes (leaks, race conditions... etc), improvements (number precision, better docs)...
That's no excuse for a proper changelog. What if you were affected by one of these bug that got fixed?