Add thirstyice/TinyDMXSerial (#4968)

DMXSerial with a revised interface

Author: thirstyice

repositories.txt

@@ -6428,6 +6428,7 @@ https://github.com/thingsboard/thingsboard-client-sdk
 https://github.com/thingSoC/embedis
 https://github.com/thinkovation/Ambimate
 https://github.com/ThisSmartHouse/CoogleIOT
+https://github.com/thirstyice/TinyDMXSerial
 https://github.com/thomasfredericks/Bounce2
 https://github.com/thomasfredericks/Chrono
 https://github.com/thomasfredericks/M5_PbHub