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

pom.xml

diff --git a/pom.xml b/pom.xml
index fe7edab..2cfc039 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,7 +30,7 @@
   </parent>
 
   <artifactId>maven-jarsigner-plugin</artifactId>
-  <version>3.0.0</version>
+  <version>3.0.1-SNAPSHOT</version>
   <packaging>maven-plugin</packaging>
 
   <name>Apache Maven Jarsigner Plugin</name>
@@ -53,7 +53,7 @@
     <connection>scm:git:https://gitbox.apache.org/repos/asf/maven-jarsigner-plugin.git</connection>
     <developerConnection>scm:git:https://gitbox.apache.org/repos/asf/maven-jarsigner-plugin.git</developerConnection>
     <url>https://github.com/apache/maven-jarsigner-plugin/tree/${project.scm.tag}</url>
-    <tag>maven-jarsigner-plugin-3.0.0</tag>
+    <tag>HEAD</tag>
   </scm>
   <issueManagement>
     <system>JIRA</system>