2FA enforcement on GitHub organization.

Hi, all.

I enabled the 2FA enforcement on the Ruby organization of
GitHub(<a href="" title=""></a>)
We faced that attackers try to get the admin permission of GitHub
organization with Gentoo, npm and other famous open-source projects.

* <a href="" title=""></a>
* <a href="" title=""></a>

If you have been kicked from ruby organization caused by this
enforcement. Please notify me after preparing to 2FA with your GitHub