Updates for 'awair' to 'awair2' migration

• Add instructions to README.md for migrating from homebridge-awair to homebridge-awair2.
• Address "StatusCodeError: 400" and "404" due to errors in handling of config.json entries.
• Check that data sampling limit does not exceed maximum allowed per endpoint.
• Set raw data sampling for non-Hobbyist tier to have minimum polling_interval of 60 seconds.
• Improve error handling for axios HTTP calls.

Replace request-promise with axios

Request-promise is deprecated and functionality replaced with axios. Additional changes:

• Change @dependabot scanning from 'daily' to 'weekly'.
• Removed extraneous packages from package-lock.json.

Add @dependabot support

• Added dependabot.yml file.
• Approved and merged @dependabot pull requests.
• Confirmed plugin operation after merges.

Update for `Verified by Homebridge` approval

Add the Verified by Homebridge badge and update README.md header.

Addition of Wiki update

• Minimum Omni occupancy level changed to 48.0dBA per Omni specifications.
• Addition of Wiki screenshots.

Omni occupancy detection improvements (part 2)

Minimum sound level set to 47dBA based on dust sensor fan noise as guard for spurious low reading. Provide option to restart detection algorithm on Homebridge restart.

Omni Occupancy Detection Improvements

Omni occupancy is now determined by monitoring minimum sound level and setting a lower and upper limit based on offset value.

Add experimental support for Omni auto occupancy detection base on minimum sound level detected.

v5.5.3

• Update build.yml to only include even numbered releases of node.js [10.x, 12.x, 14.x]
• Update README.MD to provide additional details on adding 'test' devices to 'exclude' list.
• Add experimental support for Omni auto occupancy detection base on minimum sound level detected.

Homebridge-Awair2 with Omni occupancy support

This release completes implementation of base functionality for the Awair family of air quality sensors (e.g. Awair 1st Edition, Awair Glow, Awair Mint, Awair Omni, Awair 2nd Edition, Awair Glow C, or Awair Element).