[python-committers] Welcoming Davin Potts to the Python development team

I just finished doing what was necessary to make Davin a core dev, so let's welcome our first new core dev of 2016!

And while I'm thinking about it, Davin, if you will be attending PyCon US this year in Portland, it would be great if you can make the language summit so we can all meet you in person! Details can be found in https://mail.python.org/pipermail/python-committers/2016-March/003784.html.