contrib instructions for newcomes

CONTRIBUTING.md

@@ -24,34 +24,34 @@ To contribute a feature/fix:
 Ready to contribute? Here's how to set up `Hub` for local development.
 
 1. Fork the `Hub` repo on GitHub.
-2. Clone your fork locally::
-
+2. Clone your fork locally:
+```
     $ git clone [email protected]:your_name_here/hub.git
-
+```
 3. Install your local copy into a virtualenv. Assuming you have virtualenvwrapper installed,
-   this is how you set up your fork for local development::
-
+   this is how you set up your fork for local development:
+```
     $ mkvirtualenv Hub
     $ cd Hub/
-
-4. Create a branch for local development::
-
+```
+4. Create a branch for local development:
+```
     $ git checkout -b name-of-your-bugfix-or-feature
-
+```
    Now you can make your changes locally.
 
 5. While hacking your changes, make sure to cover all your developments with the required
    unit tests, and that none of the old tests fail as a consequence of your changes.
    For this, make sure to run the tests suite and check the code coverage::
-
+```
     $ pytest .      # Run the tests
-
+```
 6. Commit your changes and push your branch to GitHub::
-
+```
     $ git add .
     $ git commit -m "Your detailed description of your changes."
     $ git push origin name-of-your-bugfix-or-feature
-
+```
 7. Submit a pull request through the GitHub website.