Remove `bignumber.js@` prefix from package-lock
This prefix caused a fail during `npm install`.
"resolved": "https://registry.npmjs.org/web3/-/web3-0.18.4.tgz",
"integrity": "sha1-gewXhBRUkfLqqJVbMcBgSeB8Xn0=",
"requires": {
- "bignumber.js": "bignumber.js@git+https://github.com/debris/bignumber.js.git#94d7146671b9719e00a09c29b01a691bc85048c2",
+ "bignumber.js": "git+https://github.com/debris/bignumber.js.git#94d7146671b9719e00a09c29b01a691bc85048c2",
"crypto-js": "^3.1.4",
"utf8": "^2.1.1",
"xhr2": "*",
