[neon-notifications] kmag new version 19.04.2

[Neon CI]

https://build.neon.kde.org/job/watcher_release_kde_kmag/393/display/redirect

#<Debian::UScan::DEHS::Package:0x000055cd32cf23f8 @name="kmag", @debian_uversion="19.04.1", @debian_mangled_uversion="19.04.1", @upstream_version="19.04.2", @upstream_url="http://download.kde.internal.neon.kde.org/stable/applications/19.04.2/src/kmag-19.04.2.tar.xz", @status="Newer version available">