schemathesis 0.18.0 on Python PyPI

Features 🚀

2fe23cf Add support for resolving references in `PathItem` objects.

Refs #301

e55ea00 Fix loading string dates as `datetime.date` objects in YAML loader

Refs #305

3e25113 Fix resolving of relative paths in schemas

Refs #303

c57b180 Fix release/pypi CI job.

dd48985 Restructure CLI output for better extensibility
4d26e6e Extract checks into a separate module
196e5fc Refactor CI

4d9224b Release 0.18.0