chore(package): update react-router to version 5.0.1

Closes #35

Author: greenkeeper[bot]

package.json

@@ -78,7 +78,7 @@
     "npm-run-all": "^4.0.1",
     "onchange": "^3.0.2",
     "react": "^15.6.1",
-    "react-router": "^4.2.0",
+    "react-router": "^5.0.1",
     "react-router-config": "^1.0.0-beta.4",
     "rimraf": "^2.5.4",
     "snazzy": "^6.0.0",