Removed react-router from dev dependencies

Author: jcastle-zz

package-lock.json

@@ -159,8 +159,7 @@
     "jest": "^24.8.0",
     "license-checker": "^24.1.0",
     "lint-staged": "^9.2.5",
-    "pa11y-ci": "^2.3.0",
-    "react-router": "^4.3.1"
+    "pa11y-ci": "^2.3.0"
   },
   "browserslist": [
     "last 2 versions",