fix(package): update query-string to version 6.8.1

Closes #11

Author: greenkeeper[bot]

package.json

@@ -74,7 +74,7 @@
     "ng-toast": "^2.0.0",
     "ngstorage": "^0.3.11",
     "nya-bootstrap-select": "^2.0.11",
-    "query-string": "5.1.1",
+    "query-string": "6.8.1",
     "raven-js": "^3.27.0",
     "startbootstrap-sb-admin-2": "^3.3.7",
     "stringify": "^5.2.0",