Discussions activated!

[bitprophet]

We're trying out Github's discussions feature here on a limited basis. The hope is that it'll redirect some traffic from external sites like StackOverflow to here (thus being a little more visible to both maintainers and users) as well as providing an outlet for input that might otherwise inflate the "issues" count despite not being an actual problem.

If it goes well I'll probably enable it over at our sibling repos such as Fabric and Paramiko.