[Koha] Security release - Koha 3.16.12

[Mason James]

The Koha release team would like to announce the release of Koha 3.16.12.

This is a security release. We strongly recommend people running a 3.16 series Koha to 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 tohttp://koha-community.org/security-release-koha-3-16-12 
<http://koha-community.org/security-release-koha-3-20-1/>  to
read the full release notes.

Cheers, Mason.