📚 Corrects project stage badge in add-on README

traccar/.README.j2

@@ -78,7 +78,7 @@ If you are more interested in stable releases of our add-ons:
 [maintenance-shield]: https://img.shields.io/maintenance/yes/2018.svg
 [patreon-shield]: https://www.frenck.nl/images/patreon.png
 [patreon]: https://www.patreon.com/frenck
-[project-stage-shield]: https://img.shields.io/badge/project%20stage-production%20ready-brightgreen.svg
+[project-stage-shield]: https://img.shields.io/badge/project%20stage-experimental-yellow.svg
 [release-shield]: https://img.shields.io/badge/version-{{ version }}-blue.svg
 [release]: {{ repo }}/tree/{{ version }}
 [screenshot]: https://github.com/hassio-addons/addon-traccar/raw/master/images/screenshot.png