update superagent

test/package.json

@@ -18,6 +18,7 @@
   },
   "dependencies": {
     "selenium-server-standalone-jar": "^3.3.1",
-    "selenium-webdriver": "^3.3.0"
+    "selenium-webdriver": "^3.3.0",
+    "superagent": "^1.8.5"
   }
 }