Fix travis build
Fix travis build

JohnColanduoni/gfx,alexcrichton/gfx,Bastacyclop/gfx,bvssvni/gfx-rs,tanderegg/gfx,ColinKinloch/gfx,gfx-rs/gfx-rs,mitchmindtree/gfx-rs,aepsil0n/gfx-rs,red75prime/gfx,JohnColanduoni/gfx,tempbottle/gfx,ColinKinloch/gfx,sectopod/gfx-rs,tanderegg/gfx,davll/gfx