Apply suggestions from code review

Author: diasbruno

package.json

@@ -58,7 +58,7 @@
     "react-router": "^4.2.0",
     "react-router-dom": "^4.2.2",
     "should": "^13.1.0",
-    "sinon": "v19.0.5",
+    "sinon": "v18.0.1",
     "uglify-js": "3.1.1",
     "webpack": "^4.46.0",
     "webpack-cli": "^3.3.12",