fix(package): update react-router-dom to version 5.1.0

Closes #311

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
     "react-resize-detector": "^2.2.0",
     "react-router": "4.2.0",
     "react-router-bootstrap": "0.24.4",
-    "react-router-dom": "4.3.0-rc.1",
+    "react-router-dom": "5.1.0",
     "react-stepzilla": "^4.6.3",
     "react-twitter-widgets": "^1.2.0",
     "sanitize-filename": "^1.6.1",