Adding new contributors for 3.1 [skip ci]
Adding new contributors for 3.1 [skip ci]

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