Add support for HyperCache

Hi, would be nice to also have auto purging of HyperCache!

e.g.: (tested and works)

function fastvelocity_purge_others()
    {
      ...

      # Purge Hyper Cache
        if ( class_exists( 'HyperCache' ) )
        {
            do_action( 'autoptimize_action_cachepurged' );
            return __( '<div class="notice notice-info is-dismissible"><p>All caches from <strong>HyperCache</strong> have also been purged.</p></div>' );
        }
}

Thank you
Erich