message: chore: add lerna test script
diff: "typescript": "~2.7.1"
  },
  "scripts": {
  - "test": "mocha",
  + "test": "lerna run test",
  "cov": "sh scripts/cov.sh",
  "ci": "npm run build && npm run cov",
  "purge": "npm run clean && rm -rf node_modules",
  