Unknown token

#### Issue description:

`synp -w --source-file ./yarn.lock`

#### Are you reporting a conversion error? Please include a link to `yarn.lock` / `package-lock.json`:
```
# This file is generated by running "yarn install" inside your project.
# Manual changes might be lost - proceed with caution!

__metadata:
  version: 6
  cacheKey: 8
...
more thousands lines
```
