Update supertest requirement from ^1.2.0 to ^3.3.0

Updates the requirements on [supertest](https://github.com/visionmedia/supertest) to permit the latest version.
- [Release notes](https://github.com/visionmedia/supertest/releases)
- [Changelog](https://github.com/visionmedia/supertest/blob/master/History.md)
- [Commits](https://github.com/visionmedia/supertest/commits/v3.3.0)

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

package.json

@@ -43,7 +43,7 @@
     "istanbul": "^0.4.1",
     "mocha": "^5.2.0",
     "sinon": "^7.0.0",
-    "supertest": "^1.2.0",
+    "supertest": "^3.3.0",
     "supertest-promised": "^1.0.0",
     "uuid": "^2.0.1"
   },