Fix more README URLs [skip ci]
Fix more README URLs [skip ci]

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