MNT: Update license year
MNT: Update license year

lpsinger/astropy,astropy/astropy,mhvk/astropy,StuartLittlefair/astropy,lpsinger/astropy,saimn/astropy,lpsinger/astropy,lpsinger/astropy,saimn/astropy,larrybradley/astropy,astropy/astropy,astropy/astropy,larrybradley/astropy,saimn/astropy,saimn/astropy,pllim/astropy,mhvk/astropy,larrybradley/astropy,saimn/astropy,pllim/astropy,StuartLittlefair/astropy,mhvk/astropy,larrybradley/astropy,astropy/astropy,mhvk/astropy,lpsinger/astropy,pllim/astropy,pllim/astropy,larrybradley/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,astropy/astropy,pllim/astropy,mhvk/astropy,StuartLittlefair/astropy