cosmic-notifications from X11:COSMIC:Factory project

For openSUSE Slowroll run the following as root:

zypper addrepo https://download.opensuse.org/repositories/X11:COSMIC:Factory/openSUSE_Slowroll/X11:COSMIC:Factory.repo
zypper refresh
zypper install cosmic-notifications

For openSUSE Factory run the following as root:

zypper addrepo https://download.opensuse.org/repositories/X11:COSMIC:Factory/openSUSE_Factory/X11:COSMIC:Factory.repo
zypper refresh
zypper install cosmic-notifications

For 16.0 run the following as root:

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