* Add new public transport sensor for RMV (Rhein-Main area).
* Add required module.
* Fix naming problem.
* Add unit test.
* Update dependency version to 0.0.5.
* Add new requirements.
* Fix variable name.
* Fix issues pointed out in review.
* Remove unnecessary code.
* Fix linter error.
* Fix config value validation.
* Replace minutes as state by departure timestamp. (see ##14983)
* More work on the timestamp. (see ##14983)
* Revert timestamp work until #14983 gets merged.
* Simplify product validation.
* Remove redundant code.
* Address code change requests.
* Address more code change requests.
* Address even more code change requests.
* Simplify destination check.
* Fix linter problem.
* Bump dependency version to 0.0.7.
* Name variable more explicit.
* Only query once a minute.
* Update test case.
* Fix config validation.
* Remove unneeded import.
cgtobi