Add Ecowitt HP2561 to device mapping

[dezmui]

Describe what the PR does:

Adds a new device (HP2561) to the mapping

Does this fix a specific issue?

Fixes #883

Checklist:

• Confirm that one or more new tests are written for the new functionality.
• Run tests and ensure everything passes (with 100% test coverage).
• Update README.md with any new documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fb8d4b5) 100.00% compared to head (db3ea4f) 100.00%.
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev      #884   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           32        32           
  Lines         1735      1735           
=========================================
  Hits          1735      1735           

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[bachya]

Thank you!