To be honest, I roughly copy-pasted it from [`firefox`](https://github.com/travis-ci/travis-build/blob/master/lib/travis/build/script/addons/firefox.rb#L13) add-on code. But [searching for other 033 usages](https://github.com/travis-ci/travis-build/search?q=033&ref=cmdform) give you certainly right:

* Majority are like `'echo -e "\033[33;1mStarting Sauce Connect\033[0m"'`
* Mmh: `"echo -e \"\033[33;1mInstalling Firefox ...`
* Mmmmh: `"echo -e \"\\033[33;1mWARNING:\\033[33m Using Objective-C ...`

Shall we unify them all? Maybe a little helper function may help to prevent similar gaps in the future...