Release v3.0.1

[lfdebrux]

Fixes

We’ve made the following fixes to the tech docs gem in pull request #281: Don't break TOC when OpenAPI description includes headers:

• we now render OpenAPI Markdown with the same Markdown renderer as other documents
• table of contents (TOC) uses TechDocsHTMLRenderer to render the headings with IDs

Thanks to @jamietanna for contributing to this issue and its solution.