Readme doesn't instruct to re-register builder post meta for custom module

[nathanbrisk]

I added a custom module as the Readme instructed, but I wasn't able to see this new module until I

$plugin->register_builder_post_meta( 'modular-page-builder', array( 'title' => __( 'Page Body Content' ), 'api_prop' => 'page_builder', 'allowed_modules' => array( 'header', 'text', 'image', 'video', 'blockquote', '<my new module name>'), ) );

Perhaps I did it the wrong way, but the Readme wasn't too exhaustive in how to add this custom module.