message: add prepublish hook
diff: "web3": "0.20.x"
  },
  "scripts": {
  + "prepublish": "yarn build",
  "build": "rm -rf ./dist && tsc -p ./tsconfig.production.json",
  "postbuild": "chmod +x ./dist/cli.js",
  "lint": "yarn formatting && yarn tslint",
  