Update repositories.txt

[nthnn]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/nthnn/TCS3200:

Linting library in TCS3200
INFO: No header file found matching library name (TCS3200.h). Best practices are for primary header filename to match   
      library name.                                                                                                     
      See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format            
      (Rule LS008)                                                                                                      
WARNING: library.properties version value 1.0 is not compliant with the semver specification.
         See: https://semver.org/                                                            
         (Rule LP021)                                                                        

Linter results for project: 0 ERRORS, 1 WARNINGS

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

Linting sketch in TCS3200/examples/full_example

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/nthnn/TCS3200/