Fix travis build
Fix travis build

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