Merge pull request #869 from msm1992/5.3.x

Upgrade siddhi version

Author: msm1992

pom.xml

@@ -1528,7 +1528,7 @@
         <!--<carbon.commons.imp.pkg.version>[4.3.0, 4.4.0)</carbon.commons.imp.pkg.version>-->
 
         <!--CEP versions-->
-        <siddhi.version>3.2.14</siddhi.version>
+        <siddhi.version>3.2.15</siddhi.version>
 
 
         <orbit.version.json>3.0.0.wso2v1</orbit.version.json>