add python 2.7 future division

Nathaniel Saul · web-flow · commit e0b17ea33274 · 2019-04-03T12:54:39.000-07:00
diff --git a/persim/persistent_entropy.py b/persim/persistent_entropy.py
@@ -19,6 +19,7 @@
 
 """
 
+from __future__ import division
 import numpy as np
 
 
