Fix doctest-requires
Fix doctest-requires

MSeifert04/astropy,bsipocz/astropy,astropy/astropy,lpsinger/astropy,DougBurke/astropy,pllim/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,dhomeier/astropy,lpsinger/astropy,dhomeier/astropy,pllim/astropy,mhvk/astropy,MSeifert04/astropy,StuartLittlefair/astropy,larrybradley/astropy,larrybradley/astropy,tbabej/astropy,astropy/astropy,astropy/astropy,aleksandr-bakanov/astropy,astropy/astropy,tbabej/astropy,joergdietrich/astropy,funbaker/astropy,larrybradley/astropy,AustereCuriosity/astropy,saimn/astropy,bsipocz/astropy,joergdietrich/astropy,joergdietrich/astropy,MSeifert04/astropy,kelle/astropy,AustereCuriosity/astropy,joergdietrich/astropy,kelle/astropy,bsipocz/astropy,pllim/astropy,dhomeier/astropy,astropy/astropy,lpsinger/astropy,tbabej/astropy,AustereCuriosity/astropy,bsipocz/astropy,lpsinger/astropy,saimn/astropy,saimn/astropy,AustereCuriosity/astropy,kelle/astropy,pllim/astropy,mhvk/astropy,StuartLittlefair/astropy,tbabej/astropy,mhvk/astropy,stargaser/astropy,StuartLittlefair/astropy,funbaker/astropy,aleksandr-bakanov/astropy,DougBurke/astropy,stargaser/astropy,lpsinger/astropy,stargaser/astropy,aleksandr-bakanov/astropy,saimn/astropy,kelle/astropy,AustereCuriosity/astropy,tbabej/astropy,saimn/astropy,dhomeier/astropy,joergdietrich/astropy,DougBurke/astropy,stargaser/astropy,mhvk/astropy,larrybradley/astropy,pllim/astropy,funbaker/astropy,MSeifert04/astropy,kelle/astropy,funbaker/astropy,mhvk/astropy,DougBurke/astropy,larrybradley/astropy,dhomeier/astropy,aleksandr-bakanov/astropy