chore(devdeps): update dependency supertest to v3.3.0

Author: renovate-bot

package-lock.json

@@ -42,7 +42,7 @@
     "husky": "0.14.3",
     "koa": "2.5.2",
     "semantic-release": "^7.0.0",
-    "supertest": "3.2.0"
+    "supertest": "3.3.0"
   },
   "keywords": [
     "content",