message: show off live dev-server(#1590)
diff: "scripts": {
  "build": "webpack --env=\"production\"",
  "dev": "webpack --env=\"development\" --watch",
  - "start": "prague-dev-server --config webpack.config.js --package package.json",
  + "start": "prague-dev-server --config webpack.config.js --live --package package.json",
  + "start:local": "prague-dev-server --config webpack.config.js --package package.json",
  "tsc": "tsc"
  },
  "devDependencies": {
  - "@prague/prague-dev-server": "^3.2.1",
  + "@prague/prague-dev-server": "^3.2.2",
  "@types/node": "^10.11.5",
  "clean-webpack-plugin": "^0.1.19",
  "ts-loader": "^4.4.2",
  