Bump requests from 2.21.0 to 2.22.0 (#98)

Bumps [requests](https://github.com/requests/requests) from 2.21.0 to 2.22.0.
- [Release notes](https://github.com/requests/requests/releases)
- [Changelog](https://github.com/kennethreitz/requests/blob/master/HISTORY.md)
- [Commits](https://github.com/requests/requests/compare/v2.21.0...v2.22.0

)

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