Update repositories.txt

[ladyada]

add https://github.com/adafruit/Adafruit_TSC2007

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/adafruit/Adafruit_TSC2007:

Linting library in Adafruit_TSC2007
WARNING: library.properties name Adafruit TSC2007 contains spaces. Although supported, best practices is to not use     
         spaces. (Rule LP015)                                                                                           
WARNING: The library.properties paragraph field repeats the sentence field. These are displayed together so redundancy  
         is not needed. (Rule LP036)                                                                                    

Linter results for project: 0 ERRORS, 2 WARNINGS

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

Linting sketch in Adafruit_TSC2007/examples/tsc2007_demo

Linter results for project: no errors or warnings

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

Linting sketch in Adafruit_TSC2007/examples/tsc2007_oleddemo

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/adafruit/Adafruit_TSC2007/