chore: bump version to 0.4.0

[ronaldvdmeer]

Bump version from 0.3.0 to 0.4.0 in preparation for the v0.4.0 release.

Changes since v0.3.0

• Add async_get_killmails endpoint for character recent killmails #8 Add async_get_killmails() endpoint
• Add automatic pagination for wallet journal, contacts and killmails #9 Automatic pagination for wallet journal, contacts, killmails
• Respect ESI Expires header to skip HTTP requests within TTL window #10 TTL/Expires caching — skip HTTP requests within ESI cache window
• Expand integration test coverage: missing endpoints, caching, and model assertions #11 Expanded integration test coverage
• Fix documentation inaccuracies: endpoint count, scope table, coverage claim #12 Documentation audit and corrections (endpoint count, scopes, pagination/caching docs)

[Copilot]

Pull request overview

Bumps the package version to 0.4.0 for the upcoming v0.4.0 release, aligning the project metadata used for packaging and distribution.

Changes:

• Update pyproject.toml project version from 0.3.0 to 0.4.0.

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