README: update urls
README: update urls

ocaml/merlin,chambart/merlin,fxfactorial/merlin,rgrinberg/merlin,dra27/merlin,neojski/merlin,dra27/merlin,neojski/merlin,rgrinberg/merlin,fxfactorial/merlin,neojski/merlin,neojski/merlin,haselwarter/merlin,dra27/merlin,rgrinberg/merlin,rgrinberg/merlin,chriskonstad/merlin,chambart/merlin,the-lambda-church/merlin,chambart/merlin,dra27/merlin,chambart/merlin,haselwarter/merlin,ocaml/merlin,the-lambda-church/merlin,haselwarter/merlin,the-lambda-church/merlin,haselwarter/merlin,chriskonstad/merlin,ocaml/merlin,fxfactorial/merlin,fxfactorial/merlin,ocaml/merlin