fix(package): update react-router to version 5.2.0

Closes #310

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "react-document-title": "2.0.3",
     "react-dom": "^16.2.0",
     "react-resize-detector": "^2.2.0",
-    "react-router": "4.2.0",
+    "react-router": "5.2.0",
     "react-router-bootstrap": "0.24.4",
     "react-router-dom": "4.3.0-rc.1",
     "react-stepzilla": "^4.6.3",