pom.xml: update wiremock-maven-plugin to 2.13.1.

Fixes a long output from the plugin:
ipastusi/wiremock-maven-plugin#12

No functional changes.

Author: php-coder

pom.xml

@@ -583,7 +583,7 @@
 
 		<togglz.version>2.5.0.Final</togglz.version>
 		<war.plugin.version>3.2.0</war.plugin.version>
-		<wiremock.plugin.version>2.13.0</wiremock.plugin.version>
+		<wiremock.plugin.version>2.13.1</wiremock.plugin.version>
 	</properties>
 
 	<build>