fix(deps): update dependency stringify-object to v3.2.1

Author: renovate[bot]

package.json

@@ -73,6 +73,6 @@
     "is-plain-object": "2.0.4",
     "lodash": "4.17.4",
     "sortobject": "1.1.1",
-    "stringify-object": "3.2.0"
+    "stringify-object": "3.2.1"
   }
 }