Release notes for 0.8.1.
Release notes for 0.8.1.

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