TLS 1.0 and 1.1 support ending on GitLab in 2018

This post announces the deprecation of TLS 1.0 and 1.1 support on GitLab.com and the GitLab API by December 15, 2018. It provides a canary environment ([canary.gitlab.com](https://canary.gitlab.com/)) for users to test their integrations and browsers for TLS 1.2 compatibility. It also lists specific client incompatibilities, including Git-Credential-Manager-for-Windows prior to 1.14.0, Git on older Red Hat versions, JGit/Java releases < JDK 8, and older Visual Studio versions, advising users to update their clients.