Add check for versions less than 2.0.4 to migrate campaign labels from transactions

app/Service/ActivatorService.php

@@ -26,9 +26,12 @@ class ActivatorService {
 	/**
 	 * Runs all activation functions
 	 *
+	 * @param $old_version
 	 * @since    1.0.0
 	 */
-	public static function activate() {
+	public static function activate($old_version = null) {
+
+		$logger = new LoggerService();
 
 		LoggerService::init();
 		TwigService::initCache();
@@ -37,7 +40,12 @@ class ActivatorService {
 		self::create_subscriptions_table();
 		self::set_defaults();
 
-		$logger = new LoggerService();
+		if ( $old_version && version_compare($old_version, '2.0.4', '<' ) ) {
+			$logger->info('Upgrading to version 2.0.4', ['previous_version' => $old_version]);
+			$result = UpdateService::sync_campaign_labels();
+			if($result) $logger->info('Updated campaign labels from transactions');
+		}
+
 		$logger->info( 'Kudos Donations plugin activated' );
 
 	}