Bump org.apache.velocity.tools: velocity-tools-generic to v3.1

Fixes CVE-2020-13959

Change-Id: Ia9b2ef5be57d405c6b89792026571acfa9d8d1b8
diff --git a/full/pom.xml b/full/pom.xml
index bbc158a..8bed441 100644
--- a/full/pom.xml
+++ b/full/pom.xml
@@ -228,9 +228,9 @@
 			<version>2.3</version>
 		</dependency>
 		<dependency>
-			<groupId>org.apache.velocity</groupId>
-			<artifactId>velocity-tools</artifactId>
-			<version>2.0</version>
+			<groupId>org.apache.velocity.tools</groupId>
+			<artifactId>velocity-tools-generic</artifactId>
+			<version>3.1</version>
 		</dependency>
 		<!-- mail -->
 		<dependency>