Upgrade to PMD 6.12.0

Fixes #89

Author: adangel

ReleaseNotes.md

@@ -13,6 +13,7 @@ This is a minor release.
 
 ### New and noteworthy
 
+*   Updated PMD to 6.12.0
 *   The package `name.herlin` is deprecated and will be removed with the next major version of the plugin.
 *   PMD markers are now problem markers again. This means, that rule violations appear in the Problem View.
     The project property "Handle high priority violations as Eclipse errors" now works again.
@@ -26,6 +27,7 @@ This is a minor release.
 *   [#76](https://github.com/pmd/pmd-eclipse-plugin/issues/76): Global rule management is saved even if cancelled
 *   [#78](https://github.com/pmd/pmd-eclipse-plugin/issues/78): Project properties cannot be loaded anymore
 *   [#86](https://github.com/pmd/pmd-eclipse-plugin/issues/86): Add Markers next to Scroll bar
+*   [#89](https://github.com/pmd/pmd-eclipse-plugin/issues/89): Upgrade to PMD 6.12.0
 *   [#1359](https://sourceforge.net/p/pmd/bugs/1359/): PMD violations in eclipse should be shown on editor by scrollbar
 
 ### External Contributions

pom.xml

@@ -16,9 +16,9 @@
   <properties>
     <tycho.version>1.3.0</tycho.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <pmd.version>6.10.0</pmd.version>
+    <pmd.version>6.12.0</pmd.version>
     <maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
-    <pmd.build-tools.version>1.3.0</pmd.build-tools.version>
+    <pmd.build-tools.version>1.4.0</pmd.build-tools.version>
     <checkstyle.version>3.0.0</checkstyle.version>
   </properties>