Fixed typo

Sorry, I'm going for another rant and this trivial fix is just a pretense!

I'm really tired to find these kind of errors in Travis CI completely unrelated to the PR contents.

Maintainers and people who have direct write access to the repo *shouldn't* use it.
GIT is not SVN.
Get your own fork and pull request from it. _Please_.

This way everyone will benefit from continuous integration.
We'll also be able to review your changes and make comments or fixes even before the code hits the main repo.

Thanks!

ping @eldy @simnandez @hregis