0.1.2

CHANGELOG:

• Better Balances:
  Balances are now a struct in rust and a more convenient class with getters for LBTC and custom assets.

• Address methods:
  Address have helper methods to convert from scriptpubkey and validate a string address

• Blinding key:
  Get blinding key of a wallet (required to convert scriptpubkey to confidential address)

• Send Assets:
  build_asset_tx() supports sending any asset (untested)

• Other misc fixes

• Better error handling (less panics)