"Remember me" mode

[Mannshoch]

Acknowledgments Please check the following boxes with an x if they apply:

• [x] The feature I want to propose would be useful for the majority of users, not only for me personally.
• [x] I am aware that Transportr is mostly developed by one person in their unpaid spare time.
• [ ] I can help myself to get this feature implemented or know someone who wants to do it.
• [ ] If I want to add support for a new region or country, I checked that this is already available in public-transport-enabler and know the process described on the Transportr homepage.

Is your feature request related to a problem? Please describe. Mostly I'm on my smartphone and liste music on my headphones. There is a possibility that I miss a station.

Describe the solution you'd like I select a route and have the option for transportr to send a notification approx. 10 seconds after the last bus stop (press the button to stop at a bus stop) and approx. 1 minute before I have to leave the vehicle.

Describe alternatives you've considered Using the Calendar item.

[Altonss]

Seems a duplicate of https://github.com/grote/Transportr/issues/399