Releasing shopify_python_api

1. Verify that the examples in the README are still valid against the latest stable API release.

2. Check the Semantic Versioning page for info on how to version the new release: http://semver.org

3. Update version in shopify/version.py

4. Update CHANGELOG entry for the release.

5. Commit the changes

git commit -m "Release vX.Y.Z"

6. Tag the release with the version

git tag -m "Release X.Y.Z" vX.Y.Z

7. Push the changes to github

git push --tags origin master

8. Shipit!