Moving this mailing list over to Discourse

[PyMedPhys]

Hi All,

To better support thread-by-thread subscription, allow users to feel like they can post side topics without needing to hit everyone's mailboxes, as well as to support direct integration within the documentation (https://docs.pymedphys.com/ref/lib/gamma.html#comments) (!!) we are moving this mailing list over to Discourse:

https://pymedphys.discourse.group/

For the next few months I'll still re-post release note links here, but once the Discourse group is thriving that too will stop.

Thanks all!

Simon