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

client/pom.xml

diff --git a/client/pom.xml b/client/pom.xml
index cfbf711..95434eb 100644
--- a/client/pom.xml
+++ b/client/pom.xml
@@ -19,7 +19,7 @@
   <parent>
     <groupId>org.apache.predictionio</groupId>
     <artifactId>predictionio-sdk-java</artifactId>
-    <version>0.13.0</version>
+    <version>0.13.1-SNAPSHOT</version>
   </parent>
 
   <artifactId>predictionio-sdk-java-client</artifactId>

pom.xml

diff --git a/pom.xml b/pom.xml
index 3206be4..8b6cb2e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,7 +19,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.predictionio</groupId>
   <artifactId>predictionio-sdk-java</artifactId>
-  <version>0.13.0</version>
+  <version>0.13.1-SNAPSHOT</version>
   <url>http://predictionio.apache.org</url>
   <packaging>pom</packaging>
   <name>Apache PredictionIO Java SDK</name>
@@ -35,7 +35,7 @@
     <connection>scm:git:https://github.com/apache/predictionio-sdk-java</connection>
     <developerConnection>scm:git:https://git-wip-us.apache.org/repos/asf/predictionio-sdk-java.git</developerConnection>
     <url>https://github.com/apache/predictionio-sdk-java</url>
-    <tag>v0.13.0</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <dependencies>