Rails reference installs

We’re in the process of upgrading to a current version of Ruby on Rails. To help with the process, we’ve generated base installations for multiple versions and provided diffs between each major version.

Like Rails itself, this code is provided under the MIT license.

How to use

1. Make sure the versions file has all the Rails versions you're interested in (currently 4.2 through 7.0).
2. Run ./install-versions, which runs the rails new command for each version.
3. Run ./diff-versions, which iterates through each version, summarizing the from the previous version.