Add Adafruit_STCC4 repository link

[ladyada]

https://github.com/adafruit/Adafruit_STCC4

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/adafruit/Adafruit_STCC4:

Linting library in Adafruit_STCC4
WARNING: library.properties name Adafruit STCC4 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)                                                                                                   

Linter results for project: 0 ERRORS, 1 WARNINGS

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

Linting sketch in Adafruit_STCC4/examples/continuous_stcc4

Linter results for project: no errors or warnings

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

Linting sketch in Adafruit_STCC4/examples/selftest_stcc4

Linter results for project: no errors or warnings

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

Linting sketch in Adafruit_STCC4/examples/singleshot_stcc4

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/adafruit/Adafruit_STCC4/