Fix dependency for heroku

package.json

@@ -14,9 +14,7 @@
     "morgan": "~1.9.1",
     "nodemon": "^2.0.2",
     "npm-run-all": "^4.1.5",
-    "rimraf": "^3.0.1"
-  },
-  "devDependencies": {
+    "rimraf": "^3.0.1",
     "@babel/cli": "^7.8.4",
     "@babel/core": "^7.8.4",
     "@babel/preset-env": "^7.8.4"