message: update dependencies for bitcoinjs-lib and ecurve
diff: },
  "dependencies": {
  "bigi": "^1.4.1",
  - "bitcoinjs-lib": "git+ssh://git@github.com/shea256/bitcoinjs-lib.git",
  + "bitcoinjs-lib": "^2.3.0",
  "blockstack-keychains": "0.0.4",
  "blockstack-zones": "0.0.1",
  "dateformat": "^1.0.12",
  - "ecurve": "git+ssh://git@github.com/shea256/ecurve.git",
  + "ecurve": "^1.0.5",
  "elliptic-curve": "^0.1.0",
  "hasprop": "0.0.4",
  "isomorphic-fetch": "^2.2.1",
  