brought over changelog updates from v0.4.x branch
brought over changelog updates from v0.4.x branch

embray/astropy_helpers,Cadair/astropy-helpers,embray/astropy_helpers,Cadair/astropy-helpers,astropy/astropy-helpers,bsipocz/astropy-helpers,larrybradley/astropy-helpers,embray/astropy_helpers,bsipocz/astropy-helpers,astropy/astropy-helpers,larrybradley/astropy-helpers,bsipocz/astropy-helpers,embray/astropy_helpers,dpshelio/astropy-helpers,dpshelio/astropy-helpers,larrybradley/astropy-helpers