Tomohiro Matsushima

Plugin name with whitespaces does not become a slug separated by hyphens

2

```wpbp.json { "plugin": { "name": "Good Plugin Name" } } ``` Expected WPBP_PLUGIN_SLUG is `good-plugin-name`. Actual WPBP_PLUGIN_SLUG is `goodpluginname`. https://github.com/WPBP/generator/blob/master/generator/init.php#L37