changelog: reconstruct for v1.7.X
changelog: reconstruct for v1.7.X

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