Add support for defer to minit <script> output

[kasparsd]

We already have async.

Can do via filter now:

add_filter( 'script_loader_tag', function( $tag, $handle ) {
        if ( 'minit-js' === $handle && false === strpos( $tag, 'defer' ) ) {
                return str_replace( 'src=', 'defer src=', $tag );
        }

        return $tag;
}, 40, 2 );