specify the required python version

akhmerov · akhmerov · commit 449e7dae013f · 2019-05-30T15:25:47.000+02:00
diff --git a/setup.py b/setup.py
@@ -23,4 +23,5 @@
         'nbconvert>=5.5',
         'nbformat',
     ],
+    python_requires = '>= 3.5',
 )
