Update repositories.txt

[MicroBeaut]

@ArduinoBot

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/MicroBeaut/MAX6816:

Linting library in MAX6816

Linter results for project: no errors or warnings

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Linting sketch in MAX6816/examples/pulldownButton
WARNING: Sketch file/folder name mismatch. The primary sketch file name must match the folder: pulldownButton.ino
         See: https://arduino.github.io/arduino-cli/latest/sketch-specification/#primary-sketch-file             
         (Rule SS001)                                                                                            

Linter results for project: 0 ERRORS, 1 WARNINGS

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Linting sketch in MAX6816/examples/pullupButton

Linter results for project: no errors or warnings

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Linting sketch in MAX6816/examples/toggle

Linter results for project: no errors or warnings

-------------------

Linter results for projects: 0 ERRORS, 1 WARNINGS

[github-actions]

Your submission has now been accepted! Thanks for your contribution to the Arduino Library Manager index.

The library(s) will be available for installation via Library Manager within a day's time.

You can check the logs from the Library Manager indexer for your library(s) here:
http://downloads.arduino.cc/libraries/logs/github.com/MicroBeaut/MAX6816/