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

pom.xml

@@ -4,7 +4,7 @@
 
   <groupId>no.finn.guava-metrics</groupId>
   <artifactId>guava-metrics</artifactId>
-  <version>1.2</version>
+  <version>1.3-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>guava-metrics reporter</name>
   <description>Report Guava cache statistics to dropwizard/(codahale) metrics</description>
@@ -34,7 +34,7 @@
     <connection>scm:git:[email protected]:finn-no/guava-metrics.git</connection>
     <developerConnection>scm:git:[email protected]:finn-no/guava-metrics.git</developerConnection>
     <url>[email protected]:finn-no/guava-metrics.git</url>
-    <tag>guava-metrics-1.2</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <properties>