modify QP_&_DJ

Author: DavitKhach

README.md

@@ -45,7 +45,8 @@ P.S. If you will find errors in the codes or in the text (grammar, math) please
 
 (c) Davit Khachatryan
 
-contacts [linkedin](https://www.linkedin.com/in/davit-khachatryan-b07383174/) [twitter](https://twitter.com/davit_khach) [facebook](https://www.facebook.com/davit.khachatryan.773)
+contacts [linkedin](https://www.linkedin.com/in/davit-khachatryan-b07383174/) ;
+[twitter](https://twitter.com/davit_khach) 
 
 email: davit.n.khachatryan@gmail.com