APT source whitelist request for nginx mainline

[tjdett]

Mainline nginx is where the new features go in, so it generally has superior reverse-proxying. Good for testing that the nginx config for your project really does proxy requests the way you think it does.

As outlined here: http://nginx.org/en/linux_packages.html#mainline

deb http://nginx.org/packages/mainline/ubuntu/ precise nginx
deb-src http://nginx.org/packages/mainline/ubuntu/ precise nginx

[ys]

I would love to see this one and the ppa:nginx/stable

[PeterDaveHello]

I've sent a pull request here: https://github.com/travis-ci/apt-source-safelist/pull/403

[PeterDaveHello]

#403 was merged 🎉