Update repositories.txt

[whchun]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://git.1-hub.cnwhchun/waveshare-epd:

Linting library in waveshare-epd
INFO: No header file found matching library name (Waveshare_EPD.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: The library.properties paragraph field repeats the sentence field. These are displayed together so redundancy  
         is not needed.                                                                                                 
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format         
         (Rule LP036)                                                                                                   

Linter results for project: 0 ERRORS, 1 WARNINGS

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

Linting sketch in waveshare-epd/examples/arduino_epd

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/whchun/waveshare-epd/