README.md refers to issue tracker

[Steven Hofmeyr]

In the README.md, under the section of release notes for the latest release, it says to add any issues to the issue tracker, but the issue tracker is inaccessible to the general public. If we're not going to make the repo public, it would be better to have an email here instead.

[Dan Bonachea]

This issue tracker is already publicly visible, it has been for weeks.