Add property project.build.outputTimestamp for reproducible builds
diff --git a/pom.xml b/pom.xml
index ed51cc8..2f7c25f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -35,6 +35,7 @@
 
   <properties>
     <javaVersion>7</javaVersion>
+    <project.build.outputTimestamp>2020-04-03T00:00:00Z</project.build.outputTimestamp>
   </properties>
 
   <contributors>