package.json main points to `src/index.js`

NodeJS now complains

```
(node:1615026) [DEP0128] DeprecationWarning: Invalid 'main' field in '/opt/share/projects/flowforge/dev-env/packages/flowfuse/node_modules/tinytar/package.json' of 'src/index.js'. Please either fix that or report it to the module author
```

Can you publish an updated version with `main` pointing to `index.js`