minor comment addition to CLASS reader
minor comment addition to CLASS reader

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