v0.4.4-beta5: Test sensor migration support

What's Changed

• Add sensor scale documentation by @krissen in #18
• Expose unscaled allergy risk value by @krissen in #23
• Use named state for allergy risk sensor by @krissen in #24
• Fix forecast format for allergy risk sensor by @krissen in #25
• Add raw allergy risk values for hourly sensor by @krissen in #26
• Normalize allergy risk forecast structure by @krissen in #27

Full Changelog: v0.4.3...v0.4.4-beta5