Patch v1.1.2

Patch v1.1.2

Contains some minor improvenemts:

• better error handling, especially in services
• Refactor and clarify calendar, device_tracker, diagnostics, entity, and service modules
• Minor code style and linting improvements
• minor bug fixes

What's Changed

• Update to 1.1 by @moehrem in #79
• update readme for HACS integration by @moehrem in #80
• Improve integration logic, error handling, and documentation by @moehrem in #81

Full Changelog: v1.1...v1.1.2