Bump umldoclet from 2.0.5 to 2.0.6 (#161)

Bumps [umldoclet](https://github.com/talsma-ict/umldoclet) from 2.0.5 to 2.0.6.
- [Release notes](https://github.com/talsma-ict/umldoclet/releases)
- [Commits](talsma-ict/umldoclet@2.0.5...2.0.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

pom.xml

@@ -104,7 +104,7 @@
         <coveralls-maven-plugin.version>4.3.0</coveralls-maven-plugin.version>
         <nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
         <buildnumber-maven-plugin.version>1.4</buildnumber-maven-plugin.version>
-        <umldoclet.version>2.0.5</umldoclet.version>
+        <umldoclet.version>2.0.6</umldoclet.version>
     </properties>
 
     <dependencies>