2.0.0

• Renamed parameter balanced to is_balanced for function binarytree.tree.
• Renamed parameter max to is_max for function binarytree.heap.
• Renamed function binarytree.pprint to binarytree.show.
• Ranamed function binarytree.setup to binarytree.customize.
• Added new utility functions using level-order node IDs: binarytree.show_ids, binarytree.show_all, binarytree.subtree, binarytree.prune (view the README for more details and examples).
• Added new utility function for getting leaf nodes: binarytree.leafs.
• Removed the ability to pretty print the tree directly using the python print keyword (e.g. print(mytree)). New ways to print them are mytree.show() or show(mytree).