Nested-Pandas v0.6.6

What's Changed

• Fix PyPI image links by @dougbrn in #427
• Fix empty-list HTML representation by @camposandro in #429
• Add is_dir shortcut for skipping directory checks by @dougbrn in #430
• Append sub-columns via map_rows by @camposandro in #433
• Display non-existing nested columns in error message by @camposandro in #425
• Bump actions/upload-artifact from 5 to 6 by @dependabot[bot] in #424
• Bump actions/cache from 4 to 5 by @dependabot[bot] in #422
• Bump dawidd6/action-download-artifact from 11 to 12 by @dependabot[bot] in #423
• _metadata override for eval() by @dougbrn in #436

Full Changelog: v0.6.5...v0.6.6