PowerShell error when building the project

Forked the repo, cloned it, followed the setup-build-run steps in [README.md](https://github.com/quicktype/quicktype/blob/master/README.md#setup-build-run).

`tsc --project src/cli` returns the following error:
`tsc : File \AppData\Roaming\npm\tsc.ps1 cannot be loaded because running scripts is disabled on this system.`
Did some research - turns out that you can also run `tsc.cmd --project src/cli`. I think it should be added to the readme.