fix 1273: freezing aiokafka version to 0.6.0

minor typo at dbmongo

Change-Id: Iaba9dc9e8f0ff50dfad7d223a3c3ee2d71d44a47
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/setup.py b/setup.py
index 25e36fd..6742c7a 100644
--- a/setup.py
+++ b/setup.py
@@ -46,7 +46,7 @@
 
     install_requires=[
         'pymongo',
-        'aiokafka',
+        'aiokafka==0.6.0',
         'PyYAML',
         'pycrypto',
     ],