Insufficient parameters

[megha-66]

In transactions like P2SH-P2WSH , when computing the signature hash , there is a need to specify the script_code explicitly, but no relevant parameter is available .

https://bitcoinlib.readthedocs.io/en/latest/source/bitcoinlib.transactions.html#bitcoinlib.transactions.Transaction.signature_hash

Adding a script_code like parameter will be helpful because without it, user has to manually calculate the entire signature hash, which is tiresome and error prone.