Use react-router@3

Author: Ken Berkeley

package.json

@@ -17,7 +17,7 @@
     "react": "^15.6.1",
     "react-dom": "^15.6.1",
     "react-redux": "^5.0.5",
-    "react-router": "^4.1.1",
+    "react-router": "^3.0.5",
     "redux": "^3.7.1",
     "redux-thunk": "^2.2.0"
   },