docs: def bump_minor_version():
      """Bump the minor version in version.py."""
      version = load_version_as_list()
      print('current version: {}'.format(format_version_string(version)))
      version[-1] += 1
      print('new version: {}'.format(format_version_string(version)))
  
      contents = "__version__ = '{}'\n".format(format_version_string(version))
  
      with open(VERSION_PATH, 'w') as wfile:
          wfile.write(contents)