Update .travis.yml
Update .travis.yml

xcpretty  is preinstalled on travis-ci, no need to install it again
http://blog.travis-ci.com
mdsb100/ytx-pod-template,NFLibs/NFLoadingController,white-rabbit-apps/PinterestSwift,NFLibs/NFLoadingController,NFLibs/NFLoadingController,epologee/pod-template,hwaxxer/pod-template,orta/pod-template,fulldecent/pod-template,mdsb100/ytx-pod-template,fulldecent/pod-template,alexdoloz/Gridy,ryutamaki/pod-template,hwaxxer/pod-template,mdsb100/ytx-pod-template,orta/pod-template,alexdoloz/Gridy,white-rabbit-apps/PinterestSwift,ryutamaki/pod-template,epologee/pod-template,alexdoloz/Gridy