message: Updated bitgo-utxo-lib version to 1.7.0-rc / 1.7.0 which supports new Blossom network params.
diff: "bigi": "^1.4.0",
  "bignumber.js": "^8.0.1",
  "bitcoinjs-message": "^2.0.0",
  - "bitgo-utxo-lib": "^1.6.0",
  + "bitgo-utxo-lib": "^1.7.0-rc",
  "bluebird": "^3.5.3",
  "bs58": "^2.0.1",
  "bs58check": "^1.0.4",
  