timekpr is missing gir1.2-appindicator3-0.1 dependency

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The timekpr tray notification will not show until gir1.2-appindicator3-0.1 is installed.
timekpr-client.py fails with error message:
ValueError: Namespace AppIndicator3 not available

Further information:
$ apt-cache policy timekpr
timekpr:
  Installé : 0.3.7~ppa1~ubuntu7~ubuntu18.04.1
  Candidat : 0.3.7~ppa1~ubuntu7~ubuntu18.04.1
 Table de version :
 *** 0.3.7~ppa1~ubuntu7~ubuntu18.04.1 500
        500 http://ppa.launchpad.net/mjasnik/ppa/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

> Please add gir1.2-appindicator3-0.1 dependency,

Thanks!