Update README.md

Author: JonathanMagnan

README.md

@@ -56,6 +56,7 @@ ctx.Users.Where(x => x.LastLoginDate < DateTime.Now.AddYears(-2))
          .Delete(x => x.BatchSize = 1000);
 ```
 
+**Support:** EF5, EF6
 **[Learn more](https://github.com/zzzprojects/EntityFramework-Plus/wiki/EF-Batch-Delete-%7C-Entity-Framework-Batch-Delete-Objects-Without-Loading-Them)**
 
 ## Batch Update