v4.0.0

⚠️ See Migration notes in the documentation for breaking changes.

• Display hostname in notifications (#102)
• Automatically determine registry options based on image name (#103)
• Docs website with mkdocs (#99)
• Skip dangling images (#98)
• More explicit massage if manifest not found (#94)
• Add swarm example
• Update doc for file and Swarm providers
• Add Kubernetes provider (#25)
• Update Teams notification screenshot (#93)
• Send message as markdown for Gotify and Telegram notifiers
• Add link to respective hub (#40)
• Configuration transposed into environment variables (#82)
• Configuration file not required anymore
• DIUN_DB env var renamed DIUN_DB_PATH
• Only accept duration as timeout value (10 becomes 10s)
• Enhanced documentation (#83)
• Add note about test notifications (#79)
• Improve configuration validation
• Fix telegram init
• All fields in configuration are now camelCased
• Docker API version negotiation (#29)
• Add Mattermost compatibility via Slack webhooks (#80)
• Update deps