update gemspec to 0.3.1
update gemspec to 0.3.1

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