chore(package): update supertest to version 3.4.2

Closes #36

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "semantic-release": "11.0.2",
     "should": "^13.1.0",
     "sqlite3": "^3.1.1",
-    "supertest": "2.0.1",
+    "supertest": "3.4.2",
     "uuid": "^3.0.1"
   },
   "repository": {