Added missing Matplotlib import
Added missing Matplotlib import

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