command not found: plugman

# Bug Report

## Problem

### What is expected to happen?
Plugman command not recognised after plugman help executed.

### What does actually happen?

command not found: plugman

## Information

I am planning to create plugin for Android and iOS after following steps from your documentation.

- npm install -g plugman
- After successfully installed try to run plugman help : "recived plugman command not found".

Tried with sudo same happening.

### Command or Code

plugman help -> command not found.

### Environment, Platform, Device

MacOS Catalina 10.15

### Version information

Cordova 10.0.0
Plugman 3.0.0
MacOS Catalina 10.15.
Node v15.3.0

## Checklist

- [x] I searched for existing GitHub issues
- [x] I updated all Cordova tooling to most recent version
- [x] I included all the necessary information above

Start by reproducing the documented `npm install -g plugman` followed by `plugman help` on macOS Catalina with Node v15.3.0, using the reported Cordova and Plugman versions. Check whether the global install location is available to the shell; done means the installed `plugman` command runs successfully without `command not found`.

Written by the indexing model from the issue text.