Crate renames

[dbrgn]

Hi, it seems that virtual-dom-rs was first renamed to percy-vdom and then to percy-dom. However, the old crates still exist on crates.io and there's nothing that hints at a rename.

Maybe you could push an update with a README that informs people about the rename, and/or yank the old crates?

[chinedufn]

Ah yeah. A README change and some yanks sounds like a good plan.