Upgrading aiokafka to 0.5.*

Change-Id: I287b95a0d9fc6132edadfb2b7b446a3ec7d9e142
Signed-off-by: Benjamin Diaz <bdiaz@whitestack.com>
diff --git a/debian/python3-osm-policy-module.postinst b/debian/python3-osm-policy-module.postinst
index 20f87d8..26a2877 100644
--- a/debian/python3-osm-policy-module.postinst
+++ b/debian/python3-osm-policy-module.postinst
@@ -23,7 +23,7 @@
 ##
 
 echo "Installing python dependencies via pip..."
-pip3 install aiokafka==0.4.*
+pip3 install aiokafka==0.5.*
 pip3 install peewee==3.8.*
 pip3 install jsonschema==2.6.*
 pip3 install pyyaml==3.*