Compatibility with npm 7?

Hi! Npm 7 now supports the similar concept for workspaces.
- How `wsrun` is bound with yarn?
- Could it be used with npm for running scripts in workspaces?

I tried to use a shell script with `--bin` option to use npm's run. It seems working, but not convenient:

npm-run.sh
```shell
#!/bin/sh
npm run "$@"
```

usage:
```shell
npx wsrun --bin="$(pwd)/npm-run.sh" -m -c clean
```