script does not recognize duplicate addresses (187 missing BTC)

I am modifying this script to create the factom genesis block. I found it does not recognize duplicate funding to the same address.

If someone sends in BTC twice to the same ether address, only the last one\* will be credited by the script.

https://github.com/ethereum/pyethsaletool/blob/master/genesis_block_generator.py#L120

*not necessarily last one in time, because bc.i and json mix things up.