Sanic-validation

None

Breaking changes:
- Dropped support for `sanic<19.3`
- Dropped support for python 3.5
- Validating repeated query args as lists no longer works - only the last provided value is validated

New features:
- Added support for python 3.8
- Added support for sanic `19.12.*` and `20.3.*`

CI:
- Added sanic `19.9.*`, `19.12.*`, `20.3.*` versions to the testing matrix
- Updated python version used to build docs

CI:
- Test against python 3.7
- Test against newer sanic releases
- Automatically create github releases from tags

CI:
- Automatically upload new versions to PyPI

New features:
- Allow custom HTTP status codes for failed validation responses (thanks, errietta )

Bugfix:
- Fix function metadata not preserved by decorators