Fix typo in format string.  Closes #391.
Fix typo in format string.  Closes #391.

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