readme: update emacs section
readme: update emacs section

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