Revert "Bail if building with Py3"

Author: vphilippon

setup.py

@@ -12,9 +12,6 @@
 except ImportError:
     from distutils.core import setup
 
-if sys.argv[-1] == 'sdist' and sys.version_info[0] >= 3:
-    print('ERROR: You must build python-future with Python 2', file=sys.stderr)
-    sys.exit(1)
 
 if sys.argv[-1] == 'publish':
     os.system('python setup.py sdist upload')