chore(package): update request to version 2.81.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -36,7 +36,7 @@
     "parse-server-simple-mailgun-adapter": "1.0.0",
     "pg-promise": "5.6.2",
     "redis": "2.6.5",
-    "request": "2.80.0",
+    "request": "2.81.0",
     "semver": "5.2.0",
     "tv4": "1.2.7",
     "winston": "2.3.1",