Dependency updates

- Bumped supertest to version 6
- Bumped yargs to version 16
- Upgraded patch/minor versions

package.json

@@ -27,7 +27,7 @@
     "lodash": "^4.17.14",
     "morgan": "^1.9.1",
     "server-destroy": "^1.0.1",
-    "yargs": "^13.2.4"
+    "yargs": "^16.1.0"
   },
   "devDependencies": {
     "coveralls": "^3.0.5",
@@ -40,6 +40,6 @@
     "get-port": "^5.0.0",
     "jest": "^24.8.0",
     "pre-commit": "^1.2.2",
-    "supertest": "^4.0.2"
+    "supertest": "^6.0.0"
   }
 }