[Koha] Koha 16.05.19 released

[Mason James]

The Koha community is proud to announce the release of Koha 16.05.19.

This is a maintenance release of 16.05 and includes 5 enhancements and
15 bugfixes.
The full release notes are available at
https://koha-community.org/koha-16-05-19-release

This will be my last release as the 16.05.x RMaint
Thanks to everyone involved, and to Tomas and Jonathan for the new
jenkins :0)

cheers, Mason