Try to use an Neopixel library for Travis CI

platformio.ini

@@ -28,7 +28,7 @@ lib_deps =
   LiquidCrystal_I2C@1.1.2
   TMC2130Stepper
   https://github.com/teemuatlut/TMC2208Stepper.git
-  Adafruit NeoPixel
+  Adafruit NeoPixel@1.1.3
   https://github.com/lincomatic/LiquidTWI2.git
   https://github.com/trinamic/TMC26XStepper.git
   https://github.com/ameyer/Arduino-L6470.git