RTD: add sphinx-astropy to requirements
RTD: add sphinx-astropy to requirements
StuartLittlefair/astropy,pllim/astropy,astropy/astropy,stargaser/astropy,saimn/astropy,aleksandr-bakanov/astropy,stargaser/astropy,mhvk/astropy,pllim/astropy,mhvk/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,bsipocz/astropy,dhomeier/astropy,mhvk/astropy,MSeifert04/astropy,MSeifert04/astropy,larrybradley/astropy,saimn/astropy,DougBurke/astropy,StuartLittlefair/astropy,lpsinger/astropy,bsipocz/astropy,astropy/astropy,astropy/astropy,pllim/astropy,bsipocz/astropy,stargaser/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,mhvk/astropy,DougBurke/astropy,mhvk/astropy,MSeifert04/astropy,pllim/astropy,DougBurke/astropy,stargaser/astropy,dhomeier/astropy,lpsinger/astropy,bsipocz/astropy,StuartLittlefair/astropy,dhomeier/astropy,pllim/astropy,larrybradley/astropy,larrybradley/astropy,MSeifert04/astropy,saimn/astropy,saimn/astropy,astropy/astropy,dhomeier/astropy,larrybradley/astropy,lpsinger/astropy,lpsinger/astropy,saimn/astropy,astropy/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,DougBurke/astropy,larrybradley/astropy