Thanks for taking the time to submit a pull request! These are the few guidelines to keep things coherent.
Fork the project and clone.
Create your feature branch:
git checkout -b features/xyz
Set up your machine. I recommend using Nix:
nix-shell
bundle install
Add your code and tests and check it passes:
bundle exec rspec
Although not required, try to adhere to Rubocop's checks:
bundle exec rubocop
Push your branch and submit a Pull Request.
Add a description of your proposed changes and why they are needed.
I'll review it as soon as I can.