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

pom.xml

@@ -30,7 +30,7 @@ under the License.
   </parent>
 
   <artifactId>maven-javadoc-plugin</artifactId>
-  <version>3.2.0</version>
+  <version>3.2.1-SNAPSHOT</version>
   <packaging>maven-plugin</packaging>
 
   <name>Apache Maven Javadoc Plugin</name>
@@ -48,7 +48,7 @@ under the License.
     <connection>scm:git:https://gitbox.apache.org/repos/asf/maven-javadoc-plugin.git</connection>
     <developerConnection>scm:git:https://gitbox.apache.org/repos/asf/maven-javadoc-plugin.git</developerConnection>
     <url>https://github.com/apache/maven-javadoc-plugin/tree/${project.scm.tag}</url>
-    <tag>maven-javadoc-plugin-3.2.0</tag>
+    <tag>HEAD</tag>
   </scm>
   <issueManagement>
     <system>jira</system>
@@ -76,7 +76,7 @@ under the License.
     <!-- for ITs -->
     <sitePluginVersion>3.3</sitePluginVersion>
     <projectInfoReportsPluginVersion>2.7</projectInfoReportsPluginVersion>
-    <project.build.outputTimestamp>2020-03-12T06:37:31Z</project.build.outputTimestamp>
+    <project.build.outputTimestamp>2020-03-12T06:39:23Z</project.build.outputTimestamp>
   </properties>
 
   <contributors>