Openapi-spec-validator

Changelog
* detect spec schema version 167
* static types and Mypy static type check 168
* tests mark network 169
* schemas and validators lazy loading proxy 170
* CLI detect spec version 171
* Shortcuts refactor and validators explicit usage 172

Backward incompatibilities
* redundant shortcuts `validate_v*_spec` and `validate_v*_spec_url` removed. Use `validate_spec` and `validate_spec_url` with `validator` parameter instead.
* `default_handlers` (and whole `handlers` package) removed. Use handlers from `jsonschema_spec.handlers` instead.

Changeling
* jsonschema subclassing fix 163
* use jsonschema spec and yield from 164

Changelog
* Use importlib_resources instead of pkg_resources 155
* Use the json module to take care of the integer keys. 146

Changelog
- Implements OpenAPI 3.1 spec validator 143

Changelog
- Drop Python 2.7, 3.5 and 3.6 support 137
- Add Python 3.10 support 137
- Bump dependency upper bounds 137
- Drop pyrsistent direct dependency 142

Changelog
- Use valid licence registry identifier for Apache-2.0 licence 139
- add setuptools dependency for pkg_resources, sort deps 141