Use raw string for warnings regex
Use raw string for warnings regex

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