Fix pep8 problem
Fix pep8 problem

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