Update redis from 3.3.2 to 3.3.4

requirements.txt

 django-environ==0.4.5
 django-redis==4.10.0
 pysolr==3.7.0
-redis==3.3.2
+redis==3.3.4
 requests==2.22.0
 uWSGI==2.0.17.1
 whitenoise==4.1.2