v0.4.0

What's Changed

• chore: Add PR description workflow by @vblagoje in #1
• test: Add tomtom integration test (refs in path params) by @vblagoje in #2
• chore: Update README.md by @vblagoje in #3
• test: Enable cohere tests by @vblagoje in #4
• test: Add firecrawl tests by @vblagoje in #6
• chore: Use gpt-4o for function calling by @vblagoje in #7
• fix: Add support for parameterless ops by @vblagoje in #11
• feat: Add async client by @vblagoje in #9
• feat: Add from_spec factory method, refine API ergonomics by @vblagoje in #12

Full Changelog: v0.3.0...v0.4.0