[Koha] Koha 17.11.11 release

The Koha community is proud to announce the release of Koha 17.11.11. This is a maintenance release. The full release notes are available at https://koha-community.org/koha-17-11-11-release/ Debian packages will be upgraded in a few days. I've proposed to continue maitaining 17.11.x in Koha 19.05 roles. Regards, -- Fridolin SOMERS <fridolin.somers@biblibre.com> BibLibre, France - software and system maintainer