Update repositories.txt to add XY6020L lib

[Jens3382]

dcdc converter can be controlled via UART

[github-actions]

A problem was found with your submission https://github.com/Jens3382/xy6020l

❌ ERROR: Unable to load submission URL. Is the repository public?

[github-actions]

Thanks for your interest in contributing to the Arduino Library Manager index @Jens3382
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.

❗ NOTE: It is not necessary to open a new pull request. ❗

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

[Jens3382]

/test merge

[Jens3382]

@ArduinoBot repo is now public

[github-actions]

Hello! I'm checking your submission again.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/Jens3382/xy6020l:

Linting library in xy6020l
WARNING: library.properties version value 1.0 is not compliant with the semver specification.
         See: https://semver.org/                                                            
         (Rule LP021)                                                                        
WARNING: library.properties url field value <follow soon> does not have a valid URL format.                    
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP041)                                                                                          
WARNING: Unable to load the library.properties url field: Head "%3Cfollow%20soon%3E": unsupported protocol scheme ""
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format     
         (Rule LP042)                                                                                               
WARNING: No license file found.                                                                                                                 
         See:                                                                                                                                   
         https://docs.github.com/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository
         (Rule LD002)                                                                                                                           
WARNING: No example sketches found. Please provide examples.                                      
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#library-examples
         (Rule LD004)                                                                             

Linter results for project: 0 ERRORS, 5 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/Jens3382/xy6020l/