This won't shake the programming world to its very core at all, no-sir-ee! Microsoft and GitHub are talking about selling GitHub to Microsoft. http://www.businessinsider.com/2-billion-startup-github-could-be-for-sale-microsoft-2018-5
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Apparently, it happened: GitHub sold itself to Microsoft. We'll know for certain tomorrow, I guess. https://www.theverge.com/2018/6/3/17422752/microsoft-github-acquisition-rumors
...And it's official. GitHub sold out to Microsoft: https://blogs.microsoft.com/blog/2018/06/04/microsoft-github-empowering-developers/