message: fix(common-ts): fix coverage command
  CI breaks since it runs coverage against all
  packages and there is no coverage command for
  `common-ts`. This adds a simple no-op so that
  coverage can be ran for all tests
diff: "lint:fix": "yarn lint:check --fix",
  "lint": "yarn lint:fix && yarn lint:check",
  "pre-commit": "lint-staged",
  - "test": "ts-mocha test/*.spec.ts"
  + "test": "ts-mocha test/*.spec.ts",
  + "test:coverage": "echo 'no coverage'"
  },
  "keywords": [
  "optimism",
  