Update repositories.txt

[SergeSkor]

No description provided.

[github-actions]

❌ ERROR: Arduino Lint found errors with https://github.com/SergeSkor/SSVTimer:

Linting library in SSVTimer
Rule LP031 result: fail
ERROR: Missing sentence field in library.properties. See https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
Rule LD002 result: fail
WARNING: No license file found. See: https://docs.github.com/en/free-pro-team@latest/github/creating-cloning-and-archiving-repositories/licensing-a-repository#detecting-a-license

Finished linting project. Results:
Warning count: 1
Error count: 1
Rules passed: false

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

Linting sketch in SSVTimer/examples/SSVTimer_Test

Finished linting project. Results:
Warning count: 0
Error count: 0
Rules passed: true

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

Finished linting projects. Results:
Warning count: 1
Error count: 1
Rules passed: false

[github-actions]

Thanks for your interest in contributing to the Arduino Library Manager index @SergeSkor
Please resolve the error(s) mentioned in the previous comment.

After resolving the issue, trigger this check again by doing one of the following:

• Commit the required change to the branch you submitted this pull request from.
• Comment here, mentioning @ArduinoBot in the comment

More information:
https://github.com/arduino/library-registry/blob/main/README.md#if-the-problem-is-with-the-pull-request

[per1234]

@SergeSkor please read my instructions in your previous pull request:
#237 (comment)

I'd appreciate it if you'd restrict yourself to a single pull request per submission. Otherwise it makes a lot of work for me to clean up all the duplicates.