Update README.md

Author: iradche

visualizations/README.md

@@ -10,5 +10,6 @@ CitNetExplorer: http://www.citnetexplorer.nl
 ### Presentations
 http://www.slideshare.net/NeesJanvanEck/advanced-bibliometric-software-tools-for-publishers-and-editors    
 http://www.slideshare.net/NeesJanvanEck/issi2015-tutorial-vosviewerandcitnetexplorer    
-http://www.slideshare.net/NeesJanvanEck/getting-started-32116907
+http://www.slideshare.net/NeesJanvanEck/getting-started-32116907     
+http://www.slideshare.net/zohrehzahedi/altmetrics-zohreh-zahediadbuparis2015