message: chore: add repo url into package.json
diff: "npm-run-all": "^4.1.5",
  "prettier": "^1.19.1",
  "yorkie": "^2.0.0"
  + },
  + "repository": {
  + "type": "git",
  + "url": "git+https://github.com/umijs/umi-next.git"
  }
  }
  