Log Message:
py-eth-account: updated to 0.5.6

eth-account v0.5.6

Features

An explicit transaction type is no longer required for signing a transaction if \ 
we can implicitly determine the transaction type from the transaction parameters

Bugfixes

When signing a transaction, the regular JSON-RPC structure is now expected as \ 
input and is converted to the appropriate rlp transaction structure when signing
Fix string interpolation in ValidationError message of _hash_eip_191_message

Improved Documentation

Updated docs for sign_transaction to show that transaction type can be \ 
implicitly determined based on transaction parameters if one is not provided
Add encode_defunct to list of example message encoders