Support for multisig wallet address

[shihao-guo]

Is there any plan to add support for retrieving input or output address when it's multisig? Right now it doesn't look like P2SH is supported

https://github.com/bitbart/blockchain-analytics-api/blob/master/src/main/scala/tcs/blockchain/bitcoin/BitcoinInput.scala#L43
https://github.com/bitbart/blockchain-analytics-api/blob/master/src/main/scala/tcs/blockchain/bitcoin/BitcoinOutput.scala#L87-L93

[stefanolande]

We are not working on it right now, but it should be a quick fix. If you want to, you are welcome to contribute with a pull request.