obs-browser: Update version to 2.20.0
30d2b6f - Add ability to zoom browser docks with Ctrl - and +
cbad08a - Use officially documented data type to persist CEF preferences
4236b56 - Persist CEF Preferences
501f624 - Add proc handler for javascript event
5a55d18 - Replace SIGNAL and SLOT macro with new style
72afb16 - Increased maximum width and height
e9eb123 - Fix leak with SchemeHandlerFactory
ea9f59d - Fix issue with unknown speaker layouts
00f1396 - Remove redundant macOS hardware acceleration check
c2aaaef - Move custom FPS property next to its FPS
Matt Gajownik