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

pom.xml

@@ -19,7 +19,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>io.zipkin.brave.ratpack</groupId>
   <artifactId>brave-ratpack</artifactId>
-  <version>2.4.1</version>
+  <version>2.4.2-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>brave-ratpack</name>
   <description>Brave instrumentation for Ratpack</description>
@@ -71,7 +71,7 @@
     <url>https://github.com/openzipkin-contrib/brave-ratpack</url>
     <connection>scm:git:https://github.com/openzipkin-contrib/brave-ratpack.git</connection>
     <developerConnection>scm:git:https://github.com/openzipkin-contrib/brave-ratpack.git</developerConnection>
-    <tag>2.4.1</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <!-- Developer section is needed for Maven Central, but doesn't need to include each person -->