v2.0.0

Changes

• Added config flow
• Added sensors for current hazard level (fixes #8)
• Added sensors for active warnings
• Added sensor for current gamma radiation level
• Changed underlying library (fixes #17)
• Improved coordinates conversion (fixes #19)
• Migrated deprecated code (fixes #20)

Breaking changes

• Removed support for YAML configuration (integration has to be manually added using UI and removed from configuration.yaml)