Hey! Yesterday's update was a minor change to react to some submitted bugs and potential-bugs as I refactor the code base and respond to some feedback and suggestions. It also adds a couple new color palette options(Flipnote DSi, Flipnote 3DS). Currently the "build date" is the best way to identify which version you have , by right-clicking an instance of the plugin and going to "About", with the latest being September 8th!
You're correct though that I should make it easier to both identify your current build and see what's new when I push updates and I should try out the Dev Log feature more to communicate this better.