Node engine is too permissive

Running on node 14.15.5 gives an error:

```
/Users/agoldis/currents-demo/node_modules/fast-json-stringify/index.js:83
rootSchemaId = schema.$id || randomUUID()
^
TypeError: randomUUID is not a function
at build (/Users/agoldis/currents-demo/node_modules/fast-json-stringify/index.js:83:32)
at Object. (/Users/agoldis/currents-demo/node_modules/roarr/dist/src/Roarr.js:15:57)
```

However, `engines` field of `package.json` claims

```
"engines": {
"node": ">=14"
},
```

[`14.17+`](https://github.com/nodejs/node/blob/main/doc/changelogs/CHANGELOG_V14.md#uuid-support-in-the-crypto-module) would be a better option