Bumped Krill version to 0.63.2

including fixes regarding empty DocIdSetIterator and warnings of
expansion failure

Change-Id: Ie220ad69186ff3051d742a0d113bfaa44e959ad5
diff --git a/pom.xml b/pom.xml
index 1c9911b..7a42c73 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,7 +18,7 @@
 		<jetty.version>11.0.19</jetty.version>
 		<flyway.version>10.6.0</flyway.version>
 		<log4j.version>2.22.1</log4j.version>
-		<krill.version>[0.63.1,)</krill.version>
+		<krill.version>[0.63.2,)</krill.version>
 		<koral.version>[0.44,)</koral.version>
 	</properties>
 	<profiles>