rename File.exists? to File.exist?
rename File.exists? to File.exist?

exists? is marked as obsolete in the API doc [madx]

pivotal-cf-experimental/fakefs,bquorning/fakefs,fakefs/fakefs,1234-/fakefs,defunkt/fakefs,ktheory/fakefs,rubyist/fakefs,vhl/fakefs,onehub/fakefs,dcrec1/fakefs,zimbatm/fakefs,bf4/fakefs,dekz/fakefs,anthonyryan1/fakefs,marxarelli/fakefs,openSUSE/fakefs,Flameeyes/fakefs,moretea/fakefs,eventualbuddha/fakefs,deployable/fakefs,lgierth/fakefs