fix js:lint warning
@@ -13,7 +13,6 @@ const bnChai = require('bn-chai')
chai.use(bnChai(BN))
const TBTCSystem = artifacts.require('TBTCSystem')
-const ECDSAKeepVendorStub = artifacts.require('ECDSAKeepVendorStub')
contract('TBTCSystem', (accounts) => {
let tbtcSystem
