[maven-release-plugin] prepare release mybatis-3.3.1

pom.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!--
   Copyright 2009-2015 the original author or authors.
 
@@ -25,7 +25,7 @@
   </parent>
 
   <artifactId>mybatis</artifactId>
-  <version>3.3.1-SNAPSHOT</version>
+  <version>3.3.1</version>
   <packaging>jar</packaging>
 
   <name>mybatis</name>
@@ -108,7 +108,7 @@
     <url>http://github.com/mybatis/mybatis-3</url>
     <connection>scm:git:ssh://github.com/mybatis/mybatis-3.git</connection>
     <developerConnection>scm:git:ssh://[email protected]/mybatis/mybatis-3.git</developerConnection>
-    <tag>HEAD</tag>
+    <tag>mybatis-3.3.1</tag>
   </scm>
   <issueManagement>
     <system>GitHub Issue Management</system>