Update rest-client requirement to >= 1.8, < 3.0
Update rest-client requirement to >= 1.8, < 3.0

Updates the requirements on [rest-client](https://github.com/rest-client/rest-client) to permit the latest version.
- [Changelog](https://github.com/rest-client/rest-client/blob/master/history.md)
- [Commits](https://github.com/rest-client/rest-client/commits/v2.0.2)
JoeSouthan/craftyclicks-ruby,JoeSouthan/craftyclicks-ruby