Updated react-router to react-router-dom 4.0.0

Author: Keven van Zuijlen

templates/ReactSpa/package.json

@@ -23,7 +23,7 @@
     "json-loader": "^0.5.4",
     "react": "~15.4.0",
     "react-dom": "~15.4.0",
-    "react-router": "^2.8.1",
+    "react-router-dom": "^4.0.0",
     "style-loader": "^0.13.1",
     "typescript": "^2.2.1",
     "url-loader": "^0.5.7",