message: Declare enum34 as dependency of pip package
  enum34 is a small package, with a size of 12 kB.
diff: @@ -32,6 +32,7 @@ from setuptools.dist import Distribution
  _VERSION = '1.3.0-rc2'
  REQUIRED_PACKAGES = [
  + 'enum34 >= 1.1.6',
  'numpy >= 1.11.0',
  'six >= 1.10.0',
  'protobuf >= 3.3.0',
  