Release v1.2.0

• Bump rpi-backlight dependency to stable 2.0.0 release
• Clarify required admin privileges on Windows

v1.1.0

• Change dependency for file change watching from inotify_simple to watchdog for cross-platform compatibility
• Improve README.md, add specific installation instructions for ARM (where PySide2 is not available as pre-built wheel from PyPI)

v1.0.0

Initial release 🥳