v0.3.0 support custom tags

Features & Enhancements

Enhanced XMP Metadata Extraction: Improved the fallback mechanism for XMP-* tags. The tool now accurately resolves standard XMP namespaces (e.g., XMP-dc:Creator) and non-colon tags (e.g., XMP-Title), while still maintaining robust extraction for custom namespaces (e.g., XMP-fujiba:*) that might be dropped during parsing.

Fixes

• Python 3.13 Compatibility: Replaced the deprecated and removed imghdr standard library with the robust filetype package for image format detection.
• Tag Whitespace Handling: Fixed an issue where EXIF tags containing accidental leading or trailing whitespace (such as from manual GUI inputs) failed to match metadata keys.

Maintenance & Infrastructure

• Migrated to uv & PEP-621: Completely overhauled project dependency management and build configurations. Transitioned from Pipenv and setup.cfg to a modern pyproject.toml managed by uv.
• Secured Supply Chain: Implemented strict dependency version pinning to mitigate supply chain attack risks.
• CI/CD Modernization: Updated GitHub Actions workflows and the Makefile to leverage the lightning-fast uv and its native uv publish capabilities instead of Pipenv and Twine.
• PyPI Ready: Established and verified the automated workflow for publishing the package to PyPI and TestPyPI.

What's Changed

• v0.2.0 by @fujiba in #6
• Fixed a crash problem caused by a some file. by @fujiba in #14
• fix: version info by @fujiba in #15
• カスタムタグ対応 by @fujiba in #16
• カスタムタグ対応、uv移行、PyPI登録 by @fujiba in #17

Full Changelog: v0.2.1...v0.3.0