Replaced smart_text with smart_str

Author: Anton-Shutik

django_elasticache/cluster_utils.py

@@ -2,7 +2,7 @@
 utils for discovery cluster
 """
 from distutils.version import StrictVersion
-from django.utils.encoding import smart_text
+from django.utils.encoding import smart_str
 import re
 from telnetlib import Telnet