Update redis to 3.3.8

requirements.txt

@@ -20,7 +20,7 @@ mockredispy==2.9.3
 pyparsing==2.0.5
 pytest==4.6.5
 pytz==2019.2
-redis==2.10.5
+redis==3.3.8
 requests==2.20.1
 simplejson==3.8.2
 sphinx-rtd-theme==0.1.9