GitHub Satellite Event: On May 6, GitHub made several feature announcements at their GitHub Satellite Event. Here's GitLab's blog post about their event.
GitHub Teams for Free: On April 14, 2020, GitHub announced that GitHub is now free for teams. GitLab has been free for teams/organizations since its inception. Read GitLab's blog post response and #GitChallenge on this move by GitHub.
2019-05-10 - GitHub announces a limited public beta for GitHub Package Registry. From the website: "With GitHub Package Registry you can safely publish and consume packages within your organization or with the entire world."