Ensure we don't try to access histogram_bin_edges on numpy < 1.15.
Ensure we don't try to access histogram_bin_edges on numpy < 1.15.

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