libgit Maintainership

Our own consultant and developer Patrick Steinhardt has recently been appointed as maintainer of the libgit2 project due to his continued work and effort. He is thus  the  third  maintainer  next  to  Carlos Martin-Nieto  from  GitHub and Edward Thompson from Microsoft. In addition to his usual tasks, he is now also in charge of  maintaining releases  and  handling additional organizational topics regarding libgit2.