debian/watch: update mangle
Imported Upstream version 0.28
Merge tag 'upstream/0.28'

Upstream version 0.28
debian/source/format: created with 1.0
debian/copyright: updated to dep5 format
debian/control: Standard-Versions 3.9.4
debian/changelog: updated
debian/copyright: copying the text file for debian/*
debhelper to 9
Ready to release!