Thanks for testing on pypy and for supporting Python 3! Sometimes it's just a small set of changes to support python 3 and testing on pypy is awesome, so thank

Thanks for testing on pypy and for supporting Python 3! Sometimes it's just a small set of changes to support python 3 and testing on pypy is awesome, so thanks! bit.PrivateKey.get_transactions -- would there be any way to filter these on transactions since a given block height?