No changes to brushes, this is just a big README update as well as adding a better download option.
Brushes.zip only contains the final combination layers, none of the NBT objects or part layers. The only exception is that Jungle cocoa/ no cocoa parts are included so you can pick between them if you wish.
By default, Brushes.zip contains Jungle trees with cocoa plants. Underwater structures like shipwrecks and ruins contain mixed loot, which will use the Minecraft loot tables for filling many chests at the time the player opens the container, but has pre-filled containers for chests that can contain Treasure Maps, replacing them with normal Empty Maps. For information on how to modify these to suit your needs, see the Advanced Use section in the README.md on the homepage.