fix(aiokafka): version now fixed to 0.6.0 (this is the latest at the moment)

Change-Id: If9477995e41497aa3171266efa1c5d88976f1cc3
Signed-off-by: bravof <fbravo@whitestack.com>
diff --git a/debian/python3-osm-policy-module.postinst b/debian/python3-osm-policy-module.postinst
index 26a2877..a095f5b 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==0.5.*
+pip3 install aiokafka==0.6.0
 pip3 install peewee==3.8.*
 pip3 install jsonschema==2.6.*
 pip3 install pyyaml==3.*