- Completely migrates to GitHub Workflows
- Adds a changelog
- Improves badges
- Upgrades to new version of `gallerist` (which includes upgraded `Pillow` and
`aiofiles`), and to the new version of `azure-storage-blob`
[(v12)](https://docs.microsoft.com/en-us/azure/storage/blobs/storage-quickstart-blobs-python)
- Improves formatting