Set next development version to 3.20.0-SNAPSHOT

Author: adangel

pom.xml

@@ -30,7 +30,7 @@ under the License.
   </parent>
 
   <artifactId>maven-pmd-plugin</artifactId>
-  <version>3.19.1-SNAPSHOT</version>
+  <version>3.20.0-SNAPSHOT</version>
   <packaging>maven-plugin</packaging>
 
   <name>Apache Maven PMD Plugin</name>