chore(deps): update dependency nodemon to v2.0.20

Author: renovate[bot]

example/package.json

@@ -34,6 +34,6 @@
     "express-session": "1.17.2"
   },
   "devDependencies": {
-    "nodemon": "2.0.15"
+    "nodemon": "2.0.20"
   }
 }