clean up whitespace in benchmark.py
clean up whitespace in benchmark.py

beni55/networkx,chrisnatali/networkx,blublud/networkx,kernc/networkx,ionanrozenfeld/networkx,harlowja/networkx,yashu-seth/networkx,jni/networkx,chrisnatali/networkx,jfinkels/networkx,dhimmel/networkx,RMKD/networkx,bzero/networkx,ionanrozenfeld/networkx,dmoliveira/networkx,farhaanbukhsh/networkx,bzero/networkx,nathania/networkx,tmilicic/networkx,ghdk/networkx,andnovar/networkx,harlowja/networkx,jakevdp/networkx,debsankha/networkx,sharifulgeo/networkx,OrkoHunter/networkx,nathania/networkx,wasade/networkx,RMKD/networkx,ghdk/networkx,michaelpacer/networkx,kernc/networkx,chrisnatali/networkx,bzero/networkx,JamesClough/networkx,debsankha/networkx,farhaanbukhsh/networkx,blublud/networkx,RMKD/networkx,dmoliveira/networkx,harlowja/networkx,SanketDG/networkx,ltiao/networkx,ionanrozenfeld/networkx,nathania/networkx,aureooms/networkx,sharifulgeo/networkx,dhimmel/networkx,kernc/networkx,farhaanbukhsh/networkx,jakevdp/networkx,debsankha/networkx,NvanAdrichem/networkx,aureooms/networkx,aureooms/networkx,sharifulgeo/networkx,dhimmel/networkx,jni/networkx,jni/networkx,ghdk/networkx,jakevdp/networkx,cmtm/networkx,dmoliveira/networkx,jcurbelo/networkx,Sixshaman/networkx,goulu/networkx,blublud/networkx