ChainWhisper

## Issue Right now, if you call the [rpc methods](https://github.com/binance-chain/javascript-sdk/blob/4a362a75b077795574902e3f43a261d37f7f2df6/src/rpc/index.js#L151), the returned valued is raw and need extra codes for decoding. ## Possible Solution Improve the functions, like [getAccount ](https://github.com/binance-chain/javascript-sdk/blob/master/src/rpc/client.js#L123)....

Ledger Nano S signature failure on transfer out: https://community.binance.org/topic/2235/re-ledger-nano-s-signature-failure-on-transfer-out Release note: https://www.ledger.com/new-firmware-update-for-ledger-nano-s/