chore: Release v0.2.0

[github-actions]

🤖 I have created a release

0.2.0 (2024-07-03)

New features

• Add a constructor for the Transport (#18) (7707c5f)
• Add convenience methods for pointer creation (#24) (90623c7)
• Add support for the Claude 3.5 Sonnet model (#27) (d0f5ca9)

Bug fixes

• Fix an ineffectual assignment to err (#11) (fdf2a64)
• Fix name of the claude-3-haiku-20240307 const (#13) (430676d)
• Fix the format of the user-agent header (#23) (de05838)
• Return an error if the context is nil (#22) (c284ec6)

Miscellaneous

• Add workflow badges to the README (#15) (059718d)
• Automatically add labels to pull requests (#17) (5c1335c)
• Configure golangci-lint in GitHub Actions (#10) (83b8766)
• Fix a broken automated commit process (#19) (a7f0d4e)
• Make version updates less fiddly (#25) (d7b24a9)
• Pull before committing version changes (#20) (c1bda69)
• Reformat code in the README document (#14) (696f732)
• Simplify user-agent and version updates (#16) (9ebd683)
• Update release-please-action organisation (#26) (a01ee1f)

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