https://minecraft.net/en-us/article/minecraft-snapshot-17w31a
We're all working very hard on 1.13, which will be a technical update to make
the game run better than ever & easier for us to add super cool things later.
But for now, we decided to create a small bugfix release for a security issue
in 1.12.
If this snapshot doesn't bring us any new issues, we'll likely pre-release
fairly soon for a quick release, so we can redouble our efforts on getting
1.13 out there!
Changes in snapshot 17w31a
Updated game credits
Fixed private bug MC-119011 - Security issue with recipe book