Bump the rails version to 6.1 for tagged version 7.13.0

[Babar-Livestorm]

You can find the forked version of the gem here, I am not able to create a pull request for some reason, can you please take a look at it.

[danielgomezrico]

@Babar-Livestorm maybe it is because you added the commits into master?

You need to:

1. Create a branch from master
2. Add your commits
3. Create a PR here with that