Prepare for releasing 0.12.0
diff --git a/pom.xml b/pom.xml
index 3fbbcdf..2ca9bb4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -29,7 +29,7 @@
 
     <groupId>org.apache.twill</groupId>
     <artifactId>twill-parent</artifactId>
-    <version>0.12.0-SNAPSHOT</version>
+    <version>0.12.0</version>
     <packaging>pom</packaging>
     <name>Apache Twill</name>
     <url>http://twill.apache.org</url>
diff --git a/twill-api/pom.xml b/twill-api/pom.xml
index 6f6b67d..8306f66 100644
--- a/twill-api/pom.xml
+++ b/twill-api/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.twill</groupId>
         <artifactId>twill-parent</artifactId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
 
     <artifactId>twill-api</artifactId>
diff --git a/twill-common/pom.xml b/twill-common/pom.xml
index 8baccaf..5902a1e 100644
--- a/twill-common/pom.xml
+++ b/twill-common/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <artifactId>twill-parent</artifactId>
         <groupId>org.apache.twill</groupId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/twill-core/pom.xml b/twill-core/pom.xml
index 7e24154..742e077 100644
--- a/twill-core/pom.xml
+++ b/twill-core/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <artifactId>twill-parent</artifactId>
         <groupId>org.apache.twill</groupId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/twill-discovery-api/pom.xml b/twill-discovery-api/pom.xml
index 7626503..20ed5de 100644
--- a/twill-discovery-api/pom.xml
+++ b/twill-discovery-api/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <artifactId>twill-parent</artifactId>
         <groupId>org.apache.twill</groupId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/twill-discovery-core/pom.xml b/twill-discovery-core/pom.xml
index c710c49..e7c949b 100644
--- a/twill-discovery-core/pom.xml
+++ b/twill-discovery-core/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <artifactId>twill-parent</artifactId>
         <groupId>org.apache.twill</groupId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/twill-examples/echo/pom.xml b/twill-examples/echo/pom.xml
index 43a7280..9710652 100644
--- a/twill-examples/echo/pom.xml
+++ b/twill-examples/echo/pom.xml
@@ -25,7 +25,7 @@
     <parent>
         <artifactId>twill-examples</artifactId>
         <groupId>org.apache.twill</groupId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
 
     <name>Apache Twill examples: Echo</name>
diff --git a/twill-examples/pom.xml b/twill-examples/pom.xml
index 936ab18..df28f16 100644
--- a/twill-examples/pom.xml
+++ b/twill-examples/pom.xml
@@ -25,7 +25,7 @@
     <parent>
         <groupId>org.apache.twill</groupId>
         <artifactId>twill-parent</artifactId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
 
     <artifactId>twill-examples</artifactId>
diff --git a/twill-examples/yarn/pom.xml b/twill-examples/yarn/pom.xml
index 6530ee2..7b93384 100644
--- a/twill-examples/yarn/pom.xml
+++ b/twill-examples/yarn/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <artifactId>twill-examples</artifactId>
         <groupId>org.apache.twill</groupId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
 
     <name>Apache Twill examples: YARN</name>
diff --git a/twill-ext/pom.xml b/twill-ext/pom.xml
index 722a8fc..cacb03e 100644
--- a/twill-ext/pom.xml
+++ b/twill-ext/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <artifactId>twill-parent</artifactId>
         <groupId>org.apache.twill</groupId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
diff --git a/twill-java8-test/pom.xml b/twill-java8-test/pom.xml
index aec8656..36b21fd 100644
--- a/twill-java8-test/pom.xml
+++ b/twill-java8-test/pom.xml
@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.twill</groupId>
         <artifactId>twill-parent</artifactId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
 
     <artifactId>twill-java8-test</artifactId>
diff --git a/twill-yarn/pom.xml b/twill-yarn/pom.xml
index 8161e90..64c5835 100644
--- a/twill-yarn/pom.xml
+++ b/twill-yarn/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <artifactId>twill-parent</artifactId>
         <groupId>org.apache.twill</groupId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/twill-zookeeper/pom.xml b/twill-zookeeper/pom.xml
index 3b0456d..3af004e 100644
--- a/twill-zookeeper/pom.xml
+++ b/twill-zookeeper/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <artifactId>twill-parent</artifactId>
         <groupId>org.apache.twill</groupId>
-        <version>0.12.0-SNAPSHOT</version>
+        <version>0.12.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>