Update repositories.txt

[MyoWareMaker]

Added MyoWare Arduino Library

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/AdvancerTechnologies/MyoWare-Arduino-Library:

Linting library in MyoWare-Arduino-Library
INFO: No header file found matching library name (MyoWare_Arduino_Library.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 MyoWare Arduino Library 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 MyoWare Arduino Library contains "Arduino". This is superfluous.                         
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP014)                                                                                          
WARNING: library.properties name MyoWare Arduino Library contains spaces. Although supported, best practices is to not  
         use spaces.                                                                                                    
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format         
         (Rule LP015)                                                                                                   
WARNING: Library name MyoWare Arduino Library contains "library". This is superfluous.                         
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP016)                                                                                          

Linter results for project: 0 ERRORS, 4 WARNINGS

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

Linting sketch in MyoWare-Arduino-Library/examples/MyoWareBLECentral

Linter results for project: no errors or warnings

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

Linting sketch in MyoWare-Arduino-Library/examples/MyoWareBLEPeripheral

Linter results for project: no errors or warnings

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

Linting sketch in MyoWare-Arduino-Library/examples/MyoWareBLEUART

Linter results for project: no errors or warnings

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

Linting sketch in MyoWare-Arduino-Library/examples/ReadMyoWareVoltage

Linter results for project: no errors or warnings

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

Linting sketch in MyoWare-Arduino-Library/examples/TestMyoWareSamplingRate

Linter results for project: no errors or warnings

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

Linter results for projects: 0 ERRORS, 4 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/AdvancerTechnologies/MyoWare-Arduino-Library/