upgrade 1.5.9 gemspec
upgrade 1.5.9 gemspec

danp60/bullet,theass/bullet,danp60/bullet,flyerhzm/bullet,yakovenkodenis/bullet,rrosenblum/bullet,yakovenkodenis/bullet,rrosenblum/bullet,hannahbot/bullet,jay3126/bullet,sideci-sample/sideci-sample-bullet,flyerhzm/bullet,rstacruz/bullet,hannahbot/bullet,rstacruz/bullet,eileencodes/bullet,sideci-sample/sideci-sample-bullet,dwb/bullet,sho-h/brakefast,sho-h/brakefast,dwb/bullet,PikachuEXE/bullet,theass/bullet,PikachuEXE/bullet,jay3126/bullet,flyerhzm/bullet,eileencodes/bullet