openapi-core 0.14 is scheduled to be the last major version in the 0.x series.
This release introduces `SpecPath` which reduces spec creation time and allows to get rid of big `schema` package
Changes:
* `Spec` replaced with `SpecPath` (318)
Backward incompatibilities:
* `create_spec` shortcut returns `SpecPath` instead of `Spec`
* removed Spec-related `schema` package
* schema-related `exceptions` moved to top level `exceptions` module
* `readOnly`/`writeOnly` invalid properties raise error (before were ommitted)
* `MediaTypeDeserializersFactory.create` expects `mimetype` string instead of `media_type`
* `MediaTypeFinder.find` returns `media_type, mimetype` tuple instead of just `media_type`