Compatibility with Yarn PNP

I'm currently using this package via Broccoli.
However it fails in my case by calling `hashForDep('.yarn\cache\broccoli-babel-transpiler-npm-7.6.0-0caf4090d4-715d71cfe7.zip\node_modules\broccoli-babel-transpiler')`:

```
.yarn\cache\resolve-package-path-npm-1.2.7-dae74e46b0-5467d60f85.zip\node_modules\resolve-package-path\index.js:58
throw e;
^

TypeError: Cannot read property 'match' of undefined
at Object.toPortablePath (.pnp.js:31159:9)
at Object.resolveToUnqualified (.pnp.js:35642:54)
at resolvePackagePath (.yarn\cache\resolve-package-path-npm-1.2.7-dae74e46b0-5467d60f85.zip\node_modules\resolve-package-path\index.js:48:23)
at Function.ModuleEntry.locate (.yarn\cache\hash-for-dep-npm-1.5.1-cd643a5817-e1c64acc43.zip\node_modules\hash-for-dep\lib\module-entry.js:163:18)
at hashForDep (.yarn\cache\hash-for-dep-npm-1.5.1-cd643a5817-e1c64acc43.zip\node_modules\hash-for-dep\index.js:66:35)
```
(It fails at `pnp.resolveToUnqualified(target + '/package.json', basedir)`). Is this command supposed to work for this argument, is this a bug of Yarn, this package or the broccoli plugin?