change cherrypy version to 18.1.2

Change-Id: Id9a2e516e253ccf174d2ac7849178da7bdac0576
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/osm_nbi/__init__.py b/osm_nbi/__init__.py
index d93de2d..3c38124 100644
--- a/osm_nbi/__init__.py
+++ b/osm_nbi/__init__.py
@@ -12,5 +12,5 @@
 # under the License.
 ##
 
-version = '6.0.2.post3'
+version = '6.0.2.post4'
 version_date = '2018-09-13'