Edit: move 'supertest' package to devDependencies

Author: phr3nzy

package.json

@@ -51,7 +51,6 @@
     "request": "^2.88.0",
     "request-promise": "^4.2.4",
     "serve-favicon": "^2.5.0",
-    "supertest": "^4.0.2",
     "swagger-ui-express": "^4.0.2"
   },
   "devDependencies": {
@@ -74,6 +73,7 @@
     "@types/swagger-ui-express": "^3.0.0",
     "cross-env": "^5.2.0",
     "jest": "^24.8.0",
+    "supertest": "^4.0.2",
     "ts-jest": "^24.0.2",
     "tsc-watch": "^2.1.2",
     "typescript": "^3.4.5"