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

diff --git a/measure/pom.xml b/measure/pom.xml
index 008426f..f80ff83 100644
--- a/measure/pom.xml
+++ b/measure/pom.xml

@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.griffin</groupId>
     <artifactId>griffin-parent</artifactId>
-    <version>0.1.5-incubating</version>
+    <version>0.1.6-incubating-SNAPSHOT</version>
   </parent>
 
   <artifactId>measure</artifactId>

diff --git a/pom.xml b/pom.xml
index 50a6551..5189299 100644
--- a/pom.xml
+++ b/pom.xml

@@ -30,7 +30,7 @@
 
     <groupId>org.apache.griffin</groupId>
     <artifactId>griffin-parent</artifactId>
-    <version>0.1.5-incubating</version>
+    <version>0.1.6-incubating-SNAPSHOT</version>
     <packaging>pom</packaging>
     <name>Apache Griffin ${project.version}</name>
     <url>http://griffin.incubator.apache.org</url>
@@ -82,7 +82,7 @@
         <connection>scm:git:https://git-wip-us.apache.org/repos/asf/incubator-griffin.git</connection>
         <developerConnection>scm:git:https://git-wip-us.apache.org/repos/asf/incubator-griffin.git</developerConnection>
         <url>https://git-wip-us.apache.org/repos/asf?p=incubator-griffin.git;a=summary</url>
-        <tag>griffin-0.1.5-incubating</tag>
+        <tag>HEAD</tag>
     </scm>
 
     <distributionManagement>

diff --git a/service/pom.xml b/service/pom.xml
index d71ac97..5d8ca9f 100644
--- a/service/pom.xml
+++ b/service/pom.xml

@@ -23,7 +23,7 @@
     <parent>
         <groupId>org.apache.griffin</groupId>
         <artifactId>griffin-parent</artifactId>
-        <version>0.1.5-incubating</version>
+        <version>0.1.6-incubating-SNAPSHOT</version>
     </parent>
 
     <artifactId>service</artifactId>

diff --git a/ui/pom.xml b/ui/pom.xml
index b8836b5..6c337d2 100644
--- a/ui/pom.xml
+++ b/ui/pom.xml

@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.griffin</groupId>
         <artifactId>griffin-parent</artifactId>
-        <version>0.1.5-incubating</version>
+        <version>0.1.6-incubating-SNAPSHOT</version>
     </parent>
   <artifactId>ui</artifactId>
   <packaging>pom</packaging>