Merge pull request k88hudson#113 from Shayac/master

add learngitbranching tutorial

Author: RichardLitt

README.md

@@ -989,6 +989,7 @@ Using git reset it is then possible to change master back to the commit it was b
 
 ## Tutorials
 
+* [Learn Git branching](https://learngitbranching.js.org/) An interactive web based branching/merging/rebasing tutorial
 * [Getting solid at Git rebase vs. merge](https://medium.com/@porteneuve/getting-solid-at-git-rebase-vs-merge-4fa1a48c53aa)
 * [git-workflow](https://github.com/asmeurer/git-workflow) - [Aaron Meurer](https://github.com/asmeurer)'s howto on using git to contribute to open source repositories
 * [GitHub as a workflow](http://hugogiraudel.com/2015/08/13/github-as-a-workflow/) - An interesting take on using GitHub as a workflow, particularly with empty PRs