update setup.py

Author: jreback

doc/source/install.rst

@@ -200,7 +200,7 @@ Dependencies
 
 * `setuptools <https://setuptools.readthedocs.io/en/latest/>`__
 * `NumPy <http://www.numpy.org>`__: 1.9.0 or higher
-* `python-dateutil <//https://dateutil.readthedocs.io/en/stable/>`__: 2.5 or higher
+* `python-dateutil <//https://dateutil.readthedocs.io/en/stable/>`__: 2.5.0 or higher
 * `pytz <http://pytz.sourceforge.net/>`__
 
 .. _install.recommended_dependencies:

setup.py

@@ -19,8 +19,6 @@
 import versioneer
 cmdclass = versioneer.get_cmdclass()
 
-PY3 = sys.version_info[0] >= 3
-
 
 def is_platform_windows():
     return sys.platform == 'win32' or sys.platform == 'cygwin'
@@ -46,7 +44,7 @@ def is_platform_mac():
 min_numpy_ver = '1.9.0'
 setuptools_kwargs = {
     'install_requires': [
-        'python-dateutil >= 2' if PY3 else 'python-dateutil',
+        'python-dateutil >= 2.5.0',
         'pytz >= 2011k',
         'numpy >= {numpy_ver}'.format(numpy_ver=min_numpy_ver),
     ],