update wcslib to 5.19.1
update wcslib to 5.19.1

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