added book Hands-on Data Visualization (#8585)

books/free-programming-books-subjects.md

@@ -252,6 +252,7 @@ Books that cover a specific programming language can be found in the  [BY PROGRA
 * [Data Mining Algorithms In R](https://en.wikibooks.org/wiki/Data_Mining_Algorithms_In_R) - Wikibooks
 * [Elements of Data Science](https://allendowney.github.io/ElementsOfDataScience/README.html) - Allen B. Downey
 * [Fundamentals of Data Visualization](https://clauswilke.com/dataviz/) - Claus O. Wilke (HTML)
+* [Hands-On Data Visualization](https://handsondataviz.org) - Jack Dougherty, Ilya Ilyankou (HTML)
 * [Internet Advertising: An Interplay among Advertisers, Online Publishers, Ad Exchanges and Web Users](http://arxiv.org/pdf/1206.1754v2.pdf) (PDF)
 * [Introduction to Data Science](https://docs.google.com/file/d/0B6iefdnF22XQeVZDSkxjZ0Z5VUE/edit?pli=1) - Jeffrey Stanton
 * [Mining of Massive Datasets](http://infolab.stanford.edu/~ullman/mmds/book.pdf) - Jure Leskovec, Anand Rajaraman, Jeffrey D. Ullman (PDF)