Mailman 3.1.0 released

The 3.1.0 release of the Mailman mailing list manager is out. "Two years after the original release of Mailman 3.0, this version contains ahuge number of improvements across the entire stack. Many bugs have beenfixed and new features added in the Core, Postorius (web u/i), and HyperKitty(archiver). Upgrading from Mailman 2.1 should be better too. We are seeingmore production sites adopt Mailman 3, and we've been getting great feedbackas these have rolled out.Important: mailman-bundler, our previous recommended way of deploying Mailman3, has been deprecated. Abhilash Raj is putting the finishing touches onDocker images to deploy everything, and he'll have a further announcement in aweek or two."New features include support for Python 3.5 and 3.6, MySQL support, new REST resources and methods, user interface and user experience improvements, and more.