Cleanup repo to note which one are compatible with the v3 API

[fatso83]

It seems most of these tools have stopped working with the latest version of the RM software (v3). Maybe go through and mark the ones that work with v3?

[Eeems]

I'd be happy to accept a PR that accomplishes this repeatably, that is clear to users, and is easy to maintain going forward. Ideally, the GitHub best practices gets updated with a way to get all the linked GitHub projects to clearly list what they support, and we can work on getting all the linked projects to follow it.

[fatso83]

Any idea how to do this? Add an additional tag/topic, like "RM-API-V3", which could be used to filter on?

[Eeems]

An additional tag to work off of might be a solution for filtering, but that is less obvious to users, having a standardized badge might be a better solution.