Replace 'travis-ci.org' with 'travis-ci.com'

Author: SkypLabs

README.md

@@ -1,8 +1,9 @@
 # Code Versioning, an Introduction with Git
 
-[![Build Status](https://travis-ci.org/SkypLabs/git-slideshow.svg)](https://travis-ci.org/SkypLabs/git-slideshow)
+[![Build Status](https://travis-ci.com/SkypLabs/git-slideshow.svg)](https://travis-ci.com/SkypLabs/git-slideshow)
 
-This repository contains a slide show made with [Reveal.js][reveal.js] for introducing [Git][git] and the general notions of code versioning.
+This repository contains a slide show made with [Reveal.js][reveal.js] for
+introducing [Git][git] and the general notions of code versioning.
 
 ## License