Update repositories.txt

[jo3-tech]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/Morgritech/MT-arduino-stepper-driver:

Linting library in MT-arduino-stepper-driver
INFO: No header file found matching library name (MT-arduino-stepper-driver.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 name value MT-arduino-stepper-driver is longer than the recommended length of 16 characters.
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format         
         (Rule LP010)                                                                                                   
WARNING: Library name MT-arduino-stepper-driver contains "Arduino". This is superfluous.                       
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP014)                                                                                          

Linter results for project: 0 ERRORS, 2 WARNINGS

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

Linting sketch in MT-arduino-stepper-driver/examples/move-by-angle-no-acceleration

Linter results for project: no errors or warnings

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

Linting sketch in MT-arduino-stepper-driver/examples/move-by-angle-with-acceleration

Linter results for project: no errors or warnings

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

Linting sketch in MT-arduino-stepper-driver/examples/move-by-jogging-with-buttons

Linter results for project: no errors or warnings

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

Linting sketch in MT-arduino-stepper-driver/examples/move-by-jogging-with-serial

Linter results for project: no errors or warnings

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

Linter results for projects: 0 ERRORS, 2 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/Morgritech/MT-arduino-stepper-driver/