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

pom.xml

@@ -2,7 +2,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd ">
   <modelVersion>4.0.0</modelVersion>
   <artifactId>assertj-core</artifactId>
-  <version>3.20.0</version>
+  <version>3.20.1-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>AssertJ fluent assertions</name>
   <description>Rich and fluent assertions for testing for Java</description>
@@ -16,7 +16,7 @@
     <developerConnection>scm:git:git@github.com:assertj/assertj-core.git</developerConnection>
     <connection>scm:git:git@github.com:assertj/assertj-core.git</connection>
     <url>git@github.com:assertj/assertj-core</url>
-    <tag>assertj-core-3.20.0</tag>
+    <tag>HEAD</tag>
   </scm>
   <issueManagement>
     <system>github</system>