Changlog updates post 2.0.16 and 3.2.3 releases [skip ci]
Changlog updates post 2.0.16 and 3.2.3 releases [skip ci]

MSeifert04/astropy,larrybradley/astropy,astropy/astropy,saimn/astropy,dhomeier/astropy,mhvk/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,pllim/astropy,mhvk/astropy,larrybradley/astropy,lpsinger/astropy,mhvk/astropy,larrybradley/astropy,lpsinger/astropy,mhvk/astropy,pllim/astropy,lpsinger/astropy,stargaser/astropy,lpsinger/astropy,saimn/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,mhvk/astropy,saimn/astropy,lpsinger/astropy,dhomeier/astropy,MSeifert04/astropy,larrybradley/astropy,dhomeier/astropy,MSeifert04/astropy,aleksandr-bakanov/astropy,saimn/astropy,aleksandr-bakanov/astropy,pllim/astropy,saimn/astropy,astropy/astropy,dhomeier/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,stargaser/astropy,pllim/astropy,astropy/astropy,pllim/astropy,stargaser/astropy,MSeifert04/astropy,stargaser/astropy,astropy/astropy,astropy/astropy,aleksandr-bakanov/astropy,larrybradley/astropy