Contributions are always welcome, however, to keep things consistent, please review the following guidelines.
If you change a core piece of functionality (i.e. in lib/*) then ensure the corresponding unit tests in the spec folder are updated.
For more information on writing unit tests with RSpec, see https://relishapp.com/rspec
Unless there's good reason, there should be no RuboCop warnings for any code you submit a pull request for. Sensible exceptions will be made, but try to keep warnings to a minimum.
When opening a pull request, compare with the development branch, rather than master. The master branch is aimed at being equal to the latest stable release; meaning all staged changes need to go into the development branch.