Update query-string to the latest version 🚀 (#1017)

* chore(package): update query-string to version 6.4.0

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -76,7 +76,7 @@
     "path-to-regexp": "3.0.0",
     "prismjs": "1.15.0",
     "prop-types": "15.7.2",
-    "query-string": "6.3.0",
+    "query-string": "6.4.0",
     "react": "16.8.4",
     "react-dnd": "7.3.2",
     "react-dnd-html5-backend": "7.2.0",