v0.3.1

What's Changed

• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #54
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #55
• Save points layer to xml even if there isn't any metadata by @adamltyson in #56
• Standardise package structure and add tests by @adamltyson in #57

Full Changelog: v0.3.0...v0.3.1