{
  "command": "ruby -rubygems -r./custom_plan -eZeus.go",

  "plan": {
    "boot": {
      "test_environment": {
        "rspec": []
      }
    }
  }
}

{
  "command": "ruby -r rubygems -r ./custom_plan -e Zeus.go",

  "plan": {
    "boot": {
      "test_environment": {
        "rspec": []
      }
    }
  }
}

Fix Zeus so that it runs again on Ruby >= 2.5.x
Fix Zeus so that it runs again on Ruby >= 2.5.x

Ruby 2.5.0 removed support for the `-ubygems` option ([source][1]). This
was introduced many many years ago so you could say `ruby -rubygems`,
which was just a shortcut for `ruby -r rubygems`. Now that's no longer
there, so we have to update how Zeus starts a Ruby process.

[1]: https://github.com/ruby/ruby/commit/9de6c712b66aad77df40661c1fc6d37e9a5c251a
