Corrected external link notation that fixes Travis build error
Corrected external link notation that fixes Travis build error

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