Update free-programming-books.md (#3057)

free-programming-books.md

@@ -1495,7 +1495,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Learn to Code JavaScript by Playing a Game](http://codecombat.com)
 * [Learning JavaScript Design Patterns](http://addyosmani.com/resources/essentialjsdesignpatterns/book/) - Addy Osmani
 * [Managing Space and Time with JavaScript - Book 1: The Basics](http://www.noelrappin.com) - Noel Rappin
-* [Marionette Exposé: Learn to write modular Javascript applicatons using Backbone Marionette and RequireJS/AMD](https://leanpub.com/marionetteexpose) - Jack Killilea  *(Leanpub account or valid email requested)*
+* [Marionette Exposé: Learn to write modular Javascript applications using Backbone Marionette and RequireJS/AMD](https://leanpub.com/marionetteexpose) - Jack Killilea  *(Leanpub account or valid email requested)*
 * [Mastering JavaScript High Performance](https://www.packtpub.com/packt/free-ebook/javascript-high-performance) - Chad R. Adams, Packt. (email address *requested*, not required)
 * [Mozilla Developer Network's JavaScript Guide](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide)
 * [O'Reilly Programming JavaScript Applications](http://chimera.labs.oreilly.com/books/1234000000262/)