Update Readme.md

MasterGroosha · MasterGroosha · commit 851d76888bd9 · 2016-05-26T00:44:39.000+03:00
Added `user` to attributes list
diff --git a/README.md b/README.md
@@ -393,6 +393,7 @@ Attributes:
 * `url`
 * `offset`
 * `length`
+* `user`
 
 
 **Here's an Example:**`message.entities[num].<attribute>`<br>
