message: green_book: Ajoute react-router explicitement
diff: "react-dom": "^15.5.4",
  "react-helmet": "^5.1.3",
  "react-redux": "^5.0.5",
  + "react-router": "^4.1.1",
  "react-router-dom": "^4.1.1",
  "reduce-reducers": "^0.1.2",
  "redux": "^3.6.0",
  