With the new GDPR directive coming in on the 25 May 2018, it would be helpful to update the README[1] with a section on GDPR and what cookies Split stores along with a description (perhaps the structure/attributes) of what is stored[2].

[1] https://github.com/splitrb/split/blob/master/README.md
[2] https://www.itgovernance.eu/blog/en/how-the-gdpr-affects-cookie-policies