Minor fixes in modify_timezone

• Minor fixes in modify timezone
• Dependencies being less restrictive
• enhance documentation

initial release

What's Changed

• Use glom for metadata by @jennykupzig in #1
• initial release of hdhelpers by @jennykupzig in #2

New Contributors

• @jennykupzig made their first contribution in #1

Changelog: https://github.com/hetida/hdhelpers/blob/main/CHANGELOG.md
Full Changelog (Commit history): https://github.com/hetida/hdhelpers/commits/v0.0.2