Update release notes for snapshotting
Update release notes for snapshotting

kluver/lenskit,tajinder-txstate/lenskit,tajinder-txstate/lenskit,vijayvani/Lenskit,tajinder-txstate/lenskit,kluver/lenskit,binweiwu/lenskit,martinlaz/lenskit,kluver/lenskit,kluver/lenskit,tajinder-txstate/lenskit,aglne/lenskit,vaibhav345/lenskit,kluver/lenskit,blankazucenalg/lenskit,vijayvani/Lenskit,amaliujia/lenskit,linjunleo/lenskit,linjunleo/lenskit,chrysalag/lenskit,aglne/lenskit,vaibhav345/lenskit,vaibhav345/lenskit,martinlaz/lenskit,vaibhav345/lenskit,amaliujia/lenskit,binweiwu/lenskit,blankazucenalg/lenskit,chrysalag/lenskit