Support for Transaction version 3

[mcbagz]

Can you add support for transaction version 3? I tried to set version=3, and I got the error

Error: Unknown version: 3

As far as I can tell, there is nothing different inside of the transaction itself, so it may be as simple as adding "3" to the array in line 185 of transaction.ts. It seems to just affect how the transaction is relayed and replaced. I am trying to use the submitPackage action in Bitcoin Core, which requires version 3 transactions.

Some info on version 3.