2.0.0

• Brightness of UltraFine should now match your built-in display much better.
• Added a pause button to manually pause synchronization without having to quit the app.
• Added a button to reset brightness offset. (Offset shouldn't really be needed anymore to match brightness, unless you have another use case for it.)
• Rewrote much of the app.

This app now requires macOS Catalina for two reasons:

1. This is a hobby project and I wanted to use the Combine framework.
2. Because the brightness synchronization uses private API, it doesn't make much sense to support multiple macOS versions. Catalina seems to have changed some things in relation to display brightness and it's too much hassle for me to test this app on Mojave.