Merge pull request #7 from watsonwork/greenkeeper/supertest-4.0.0

Update supertest to the latest version 🚀

Author: olgierdp

package-lock.json

@@ -11,7 +11,7 @@
   "devDependencies": {
     "mocha": "^5.2.0",
     "semistandard": "^12.0.1",
-    "supertest": "^3.3.0"
+    "supertest": "^4.0.0"
   },
   "engines": {
     "node": ">=6.9.1",