fix string format for python2.6
fix string format for python2.6

MaryanMorel/faker,jaredculp/faker,trtd/faker,beetleman/faker,joke2k/faker,meganlkm/faker,HAYASAKA-Ryosuke/faker,venmo/faker,danhuss/faker,ericchaves/faker,GLMeece/faker,xfxf/faker-python,joke2k/faker,thedrow/faker,yiliaofan/faker,xfxf/faker-1,johnraz/faker