Canonical W-ETC package.
Inspiration from Canonical W-ETH package. See: https://blog.0xproject.com/canonical-weth-a9aa7d0279dd
npm install --save truffle-contract canonical-wethand
const contract = require('truffle-contract');
const wethArtifact = require('canonical-weth');
const weth = contract(wethArtifact);