Update webmock requirement from ~> 2.3 to ~> 3.6 (#7)
Update webmock requirement from ~> 2.3 to ~> 3.6 (#7)

Updates the requirements on [webmock](https://github.com/bblimke/webmock) to permit the latest version.
- [Release notes](https://github.com/bblimke/webmock/releases)
- [Changelog](https://github.com/bblimke/webmock/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bblimke/webmock/compare/v2.3.0...v3.6.0)
3zcurdia/waqi,3zcurdia/waqi