Ugrade HerdDB to 0.13.1 (#235)

diff --git a/gradle.properties b/gradle.properties
index 112801d..e8fb19a 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -16,6 +16,6 @@
 mockitoJunit4Version=1.7.1
 gsonVersion=2.8.2
 postgresqlVersion=42.2.5
-herddbVersion=0.13.0
+herddbVersion=0.13.1
 brokerVersion=2.4.1
 commonsValidatorVersion=1.6