Fix stupid class renaming

Author: MaximeCulea

classes/plugin.php

@@ -12,14 +12,14 @@ public static function activate() {
 		// For safety, delete existing data
 		DB::get_instance()->delete_blog( get_current_blog_id() );
 
-		Cron::schedule();
+		Crons::schedule();
 	}
 
 	/**
 	 * Plugin deactivation
 	 */
 	public static function deactivate() {
 		DB::get_instance()->delete_blog( get_current_blog_id() );
-		Cron::unschedule();
+		Crons::unschedule();
 	}
-}
+}