Refactor angle_utilities to avoid DeprecationWarning in numpy >=1.17.
Refactor angle_utilities to avoid DeprecationWarning in numpy >=1.17.

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