Update to 2.13.0
Give Maintainership to Submitter
Changelog: https://github.com/bobthecow/mustache.php/releases/tag/v2.13.0

PR: 242216
Submitted by: Marc Veldman <marc@bumblingdork.com> (new Maintainer)
MFH: 2019Q4 (hat: ports-secteam)
Sponsored by: Netzkommune GmbH