[maven-release-plugin] prepare for next development iteration

pom.xml

@@ -11,7 +11,7 @@
 
   <groupId>org.jenkins-ci.plugins</groupId>
   <artifactId>docker-commons</artifactId>
-  <version>1.19</version>
+  <version>${revision}${changelist}</version>
   <packaging>hpi</packaging>
 
   <name>Docker Commons Plugin</name>
@@ -28,11 +28,11 @@
     <connection>scm:git:git://github.com/jenkinsci/${project.artifactId}-plugin.git</connection>
     <developerConnection>scm:git:git@github.com:jenkinsci/${project.artifactId}-plugin.git</developerConnection>
     <url>http://github.com/jenkinsci/${project.artifactId}-plugin</url>
-    <tag>docker-commons-1.19</tag>
+    <tag>${scmTag}</tag>
   </scm>
 
   <properties>
-    <revision>1.19</revision>
+    <revision>1.20</revision>
     <changelist>-SNAPSHOT</changelist>
     <jenkins.version>2.222.4</jenkins.version>
     <java.level>8</java.level>