version arg doesn't recognise loader and plugin subcommands

[jamesgeorge007]

Describe the bug
webpack-cli loader | plugin --version fails.

What is the current behavior?
webpack-cli plugin --version

Error: External package not found.

webpack-cli 4.0.0-beta.8
webpack 4.43.0

To Reproduce

• webpack-cli plugin --version
• webpack-cli loader --version

Expected behavior
webpack-cli plugin --version

@webpack-cli/generate-plugin 1.0.1-alpha.5
webpack-cli 4.0.0-beta.8
webpack 4.43.0

Please paste the results of webpack-cli info here, and mention other relevant information

  System:
    OS: macOS 10.15.5
    CPU: (8) x64 Intel(R) Core(TM) i5-8279U CPU @ 2.40GHz
    Memory: 416.13 MB / 8.00 GB
  Binaries:
    Node: 13.11.0 - /usr/local/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 6.14.5 - /usr/local/bin/npm
  Browsers:
    Brave Browser: 83.1.10.97
    Safari: 13.1.1
  Packages:
    webpack: ^4.43.0 => 4.43.0
  Global Packages:
    webpack-cli: 4.0.0-beta.8

Additional context
N/A

[jamesgeorge007]

#1661