Enable to run the generator

[antleblanc]

Description

Running the generator reported an error.

Steps to Reproduce

1. yo ovh-drupal-theme
2. answer questions

? Enter the new theme name: My Awesome Theme
? Enter the module machine name: my_awesome_theme
? Enter theme description: foo
? Enter package name: foo
? Enter Drupal Core version: 8.x
? Do you want to be a sub-theme? No

3. see error

Expected behavior:

Generator should work.

Actual behavior:

Here is the error reported:

npm ERR! code 1
npm ERR! Command failed: git checkout 4.0
npm ERR! error: pathspec '4.0' did not match any file(s) known to git
npm ERR!

Reproduces how often:

All the the time.

Additional Information

Seems to be related to this error: ovh/gulp-drupal-stack#22