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

pom.xml

@@ -30,7 +30,7 @@
   </parent>
 
   <artifactId>maven-ear-plugin</artifactId>
-  <version>3.1.0</version>
+  <version>3.1.1-SNAPSHOT</version>
   <packaging>maven-plugin</packaging>
 
   <name>Apache Maven EAR Plugin</name>
@@ -44,7 +44,7 @@
     <connection>scm:git:https://gitbox.apache.org/repos/asf/maven-ear-plugin.git</connection>
     <developerConnection>scm:git:https://gitbox.apache.org/repos/asf/maven-ear-plugin.git</developerConnection>
     <url>https://github.com/apache/maven-ear-plugin/tree/${project.scm.tag}</url>
-    <tag>maven-ear-plugin-3.1.0</tag>
+    <tag>HEAD</tag>
   </scm>
   <issueManagement>
     <system>JIRA</system>
@@ -85,7 +85,7 @@
     <mavenVersion>3.0</mavenVersion>
     <javaVersion>7</javaVersion>
     <surefire.version>2.22.2</surefire.version>
-    <project.build.outputTimestamp>2020-09-26T20:10:09Z</project.build.outputTimestamp>
+    <project.build.outputTimestamp>2020-09-26T20:10:30Z</project.build.outputTimestamp>
   </properties>
 
   <dependencies>