Add python_requires to help pip

diff --git a/setup.py b/setup.py
index 7f43ca6166d18e5e02e1973e95b4b4962ed404e8..ce181b569be6e07a72a6ca061935854e338807e2 100755 (executable)
--- a/setup.py
+++ b/setup.py
@@ -68,6 +68,7 @@ direct manipulation of DNS zones, messages, names, and records.""",
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         ],
+    'python_requires': '>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
     'test_suite': 'tests',
     'provides': ['dns'],
     'extras_require': {