Please use the native JSON object instead of JSON 3

```sh
npm install
npm WARN deprecated json3@3.3.2: Please use the native JSON object instead of JSON 3
npm WARN deprecated json3@3.2.6: Please use the native JSON object instead of JSON 3
```

See: https://github.com/CyberNinjas/TallyCTF/issues/11

Homepage: https://www.npmjs.com/package/json3