Mock-services

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- Nothing changed yet.

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- Python 3 compatibility
- Update pip

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- Add HEAD method
- Add missing PUT method
- Move to requests-mock
- Raise ConnectionError on unmatched request
- Fix too restrictive body argument handling

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- Add/remove logs
- Add validators
- Make optional field validation
- Fix UUID serialization
- Enhance README
- Rename to mock-services
- Add service behaviour
- Add CI shield
- Add make release
- Add first implementation
- Initial commit