Fix contributing guidelines typos

CONTRIBUTING.md

@@ -10,9 +10,9 @@ Contributions to this project are [released](https://help.github.com/articles/gi
 ## Submitting a pull request
 
 0. [Fork][fork] and clone the repository
-0. Create a new branch: `git checkout -b my-branch-name`
-0. Make your change, push to your fork and [submit a pull request][pr]
-0. Pat your self on the back and wait for your pull request to be reviewed and merged.
+1. Create a new branch: `git checkout -b my-branch-name`
+2. Make your change, push to your fork and [submit a pull request][pr]
+3. Pat your self on the back and wait for your pull request to be reviewed and merged.
 
 Here are a few things you can do that will increase the likelihood of your pull request being accepted: