[username] shortcode in activation message

I needed to use the usefully provided [username] shortcode in the activation message, but it proved unavailable. The below patch should fix this:

diff --git a/wp-content/plugins/bp-registration-options/includes/core.php b/wp-content/plugins/bp-registration-options/includes/core.php
index 271e1d9..5b8b4e1 100755
--- a/wp-content/plugins/bp-registration-options/includes/core.php
+++ b/wp-content/plugins/bp-registration-options/includes/core.php
@@ -12,12 +12,15 @@
  */
 function bp_registration_options_bp_after_activate_content() {
        $user = get_current_user_id();
+       $user_info = get_userdata( $user );
+
        $moderate = get_option( 'bprwg_moderate' );
 
        $activate_screen = ( false === strpos( $_SERVER['REQUEST_URI'], 'activate' ) ) ? false : true;
        if ( $activate_screen || bp_registration_get_moderation_status( $user ) ) {
                if ( $moderate ) {
                        $activate_message = stripslashes( get_option( 'bprwg_activate_message' ) );
+                       $activate_message = str_replace( '[username]', $user_info->data->user_login, $activate_message ); 
                        echo '<div id="message" class="error"><p>' . $activate_message . '</p></div>';
                }
        }

ps. thanks for the otherwise useful plugin.