message: Update root coverage command
diff: "test": "lerna run test",
  "test-firefox": "lerna run test-firefox",
  "test-chrome": "lerna run test-chrome",
  - "coverage": "lerna run coverage",
  + "coverage": "yarn workspaces foreach run coverage",
  "build": "lerna run build",
  "docs": "lerna run docs"
  },
  