Bump to Gerrit 2.15.3

Change-Id: Iad6d01ea65b0ba2abb7a4cc706dd7b206874c044

pom.xml

diff --git a/pom.xml b/pom.xml
index 03d2d8d..dcc8ef6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,7 +18,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.googlesource.gerrit.plugins.github</groupId>
   <artifactId>github-parent</artifactId>
-  <version>2.15.2</version>
+  <version>2.15.3</version>
   <name>Gerrit Code Review - GitHub integration</name>
   <url>http://www.gerritforge.com</url>
   <packaging>pom</packaging>