v0.4.1

What's Changed

• Last remaining enhancements and fixes for supporting natural gas data by @N3rdP1um23 in #46, including:
  a. Upgraded workflow actions to use latest actions and updated flow
  b. Updated tests to use pytest and coverage across both electricity and natural gas sensors
  c. Refactored some of the code base
  d. Removed older data properties from OEB and added some of the new ones
  e. Resolved some issue with the unit of measure
  f. Updated the README to include additional writing, preview images, and badges to support latest changes
  g. Fixed issue when attempting to unload an OEB entity from HomeAssistant

Full Changelog: v0.4.0...v0.4.1