fix(postinst): wrong version in postinst file for aiokafka

Change-Id: I5144150f6e41ff39820a9154407438364a219670
Signed-off-by: bravof <fbravo@whitestack.com>
(cherry picked from commit c9ee37d46cde6000c5e964532ee5aa535fdf22b0)
diff --git a/debian/python3-osm-mon.postinst b/debian/python3-osm-mon.postinst
index ff08172..f7bc53b 100644
--- a/debian/python3-osm-mon.postinst
+++ b/debian/python3-osm-mon.postinst
@@ -23,7 +23,7 @@
 ##
 
 echo "Installing python dependencies via pip..."
-pip3 install aiokafka==0.4.*
+pip3 install aiokafka==0.6.0
 pip3 install requests==2.18.*
 pip3 install python-keystoneclient==3.15.*
 pip3 install six==1.11.*