You can no longer use password-based HTTP basic authentication for the few endpoints on GitHub.com that previously supported it. The affected endpoints include Atom feeds, a legacy repository archive endpoint, and a GitHub Enterprise only “stafftools reports” endpoint. This functionality will continue to work with personal access tokens. Password-based HTTP basic authentication for these endpoints will continue to function for GitHub Enterprise, but is deprecated and will be removed in an upcoming release.
GitHub Enterprise accounts can now use their own SSH certificate authority to issue SSH certificates to organization members that grant access to organization-owned repositories via Git. SSH certificate authorities can be managed at both the enterprise account and organization level.