Fix deprecation warning message
Fix deprecation warning message

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