Fix markdown formatting.

Author: khamidou

README.md

@@ -326,12 +326,21 @@ Please sign the [Contributor License Agreement](https://nylas.com/cla.html) befo
 ### Releasing a new version
 
 We have a three-step process for releasing a new version of the Python SDK. Remember that people depend on this library not breaking, so don't cut corners.
+
 1. Run the unit tests.
     `python setup.py test`
 2. Run the "system" tests. They use a live server to check that everything works as expected, so you'll need to have a valid Nylas application id and secret.
    In the tests directory you'll find a file named `tests/credentials.py.template`. Rename it into `credentials.py` and change the APP_ID and APP_SECRET to your own app id and secret.
-   Run `PYTHONPATH=/your-sdk-path python tests/oauth.py` and `PYTHONPATH=/your-sdk-path python tests/system.py`.
+
+   Run the tests:
+   
+   ```shell
+   PYTHONPATH=/your-sdk-path python tests/oauth.py
+   PYTHONPATH=/your-sdk-path python tests/system.py
+   ```
+   
 3. Finally, you can create a new release by doing:
+
     ```shell
     python setup.py release <major/minor/patch>
     git log # to verify