Update package.json

There is no longer a button.py

Author: fgrossman

package.json

@@ -2,7 +2,6 @@
     "urls": [
       ["XRPLib/__init__.py", "github:Open-STEM/XRP_Micropython/XRPLib/__init__.py"],
       ["XRPLib/board.py", "github:Open-STEM/XRP_Micropython/XRPLib/board.py"],
-      ["XRPLib/button.py", "github:Open-STEM/XRP_Micropython/XRPLib/button.py"],
       ["XRPLib/defaults.py", "github:Open-STEM/XRP_Micropython/XRPLib/defaults.py"],
       ["XRPLib/drivetrain.py", "github:Open-STEM/XRP_Micropython/XRPLib/drivetrain.py"],
       ["XRPLib/encoded_motor.py", "github:Open-STEM/XRP_Micropython/XRPLib/encoded_motor.py"],