A change of maintainership for Mercurial

A change of maintainership for Mercurial

At least for now, Mercurial is in a safe position - Mozilla, Google and Facebook all have very active contributors, and Unity3D and Fujitsu both provide regular patches. Looking at the link, Matt's plan is to slowly hand over to the existing contributors over the next 6 months; I'm sure Facebook is supporting him in this move; assuming no seriously bad luck, Mercurial will thrive without Matt.