v0.5.0

What's Changed

• feat: implement shared key authentication for Azure Storage. by @peterhuene in #26
• feat: store content digest metadata for uploaded objects. by @peterhuene in #27
• refactor: make Config mutable, excepting the backend configurations. by @peterhuene in #29
• release: bump version to 0.5.0. by @peterhuene in #28

Full Changelog: v0.4.0...v0.5.0