message: add prop-types package
diff: "main": "common/index.jsx",
  "description": "MyEtherWallet v4",
  "dependencies": {
  + "prop-types": "^15.5.8",
  "react": "^15.4.2",
  "react-dom": "^15.4.2",
  "react-redux": "^5.0.3",
  "react-router": "^3.0.0",
  "react-router-redux": "^4.0.8",
  "redux": "^3.6.0",
  + "redux-logger": "^3.0.1",
  "redux-thunk": "^2.2.0",
  "semantic-ui-css": "^2.2.9",
  "semantic-ui-react": "^0.67.2",
  