Update repositories.txt

[ClemensAtElektor]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/ClemensAtElektor/Nano_Every_WS2812B:

Linting library in Nano_Every_WS2812B
WARNING: library.properties name value Nano_Every_WS2812B is longer than the recommended length of 16 characters. (Rule 
         LP010)                                                                                                         

Linter results for project: 0 ERRORS, 1 WARNINGS

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Linting sketch in Nano_Every_WS2812B/examples/Bitmap

Linter results for project: no errors or warnings

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Linting sketch in Nano_Every_WS2812B/examples/Snake

Linter results for project: no errors or warnings

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Linting sketch in Nano_Every_WS2812B/examples/Stroboscope

Linter results for project: no errors or warnings

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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/ClemensAtElektor/Nano_Every_WS2812B/