Upgrade PMD to 5.6.1-SNAPSHOT

Author: adangel

net.sourceforge.pmd.eclipse.plugin/META-INF/MANIFEST.MF

@@ -50,6 +50,7 @@ Bundle-ClassPath: target/lib/antlr-runtime.jar,
  target/lib/pmd-ruby.jar,
  target/lib/pmd-scala.jar,
  target/lib/pmd-swift.jar,
+ target/lib/pmd-visualforce.jar,
  target/lib/pmd-vm.jar,
  target/lib/pmd-xml.jar,
  target/lib/rhino.jar,

pom.xml

@@ -16,7 +16,7 @@
   <properties>
     <tycho.version>0.26.0</tycho.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <pmd.version>5.5.5</pmd.version>
+    <pmd.version>5.6.1-SNAPSHOT</pmd.version>
     <maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
   </properties>