[Koha] Security release - Koha 3.20.1

[Chris Cormack]

The Koha release team would like to announce the release of Koha 3.20.1,
this is a security and a bugfix release.

As such we strongly recommend people running 3.20.0 should upgrade as soon
as possible

Special thanks also goes to Raschin Tavakoli and Dimitris Simos from SBA
Research for finding and reporting the security bugs.

Please go to http://koha-community.org/security-release-koha-3-20-1/ to
read the full release notes


Chris