release 0.2.3

What's Changed

• 0.2.3 — adopt diffo 0.4.1 changes, BaseCharacteristic auto-actions, a… by @matt-beanland in #50
• 49 pri by @matt-beanland in #52
• 51 livebook and improve documentation by @matt-beanland in #53
• release 0.2.3 by @matt-beanland in #54
• fix README.md by @matt-beanland in #55
• release 0.2.3 by @matt-beanland in #56

Full Changelog: v0.2.2...v0.2.3