update changelog for Dinos' cfquantity refactor
update changelog for Dinos' cfquantity refactor

bsipocz/pyspeckit,allisony/pyspeckit,vlas-sokolov/pyspeckit,jpinedaf/pyspeckit,low-sky/pyspeckit,pyspeckit/pyspeckit,keflavich/pyspeckit,vlas-sokolov/pyspeckit,mikelum/pyspeckit,dinossimpson/pyspeckit,dinossimpson/pyspeckit,allisony/pyspeckit,keflavich/pyspeckit,mikelum/pyspeckit,e-koch/pyspeckit,pyspeckit/pyspeckit,bsipocz/pyspeckit,low-sky/pyspeckit,jpinedaf/pyspeckit,e-koch/pyspeckit