Add this under the repositories key:
{
"type": "package",
"package": {
"name": "efork/cleanimal",
"version": "1.0",
"type":"drupal-theme",
"source": {
"url": "https://github.com/Daveiano/cleanimal.git",
"type": "git",
"reference": "8.x-1.x"
}
}
},
composer require efork/cleanimal
Use this after color settings have changed (new color added in theme for coniguration):
drush cdel color.theme.cleanimal