chore(deps): bump superagent from 5.1.1 to 5.2.2

Bumps [superagent](https://github.com/visionmedia/superagent) from 5.1.1 to 5.2.2.
- [Release notes](https://github.com/visionmedia/superagent/releases)
- [Changelog](https://github.com/visionmedia/superagent/blob/master/HISTORY.md)
- [Commits](forwardemail/superagent@v5.1.1...v5.2.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package.json

@@ -11,7 +11,7 @@
     "prepublish": "npm build"
   },
   "dependencies": {
-    "superagent": "5.1.1",
+    "superagent": "5.2.2",
     "uglify-js": "^3.1.3"
   },
   "devDependencies": {