Change the version format to x.y.z(2.1.0) from x.y(2.1)

Fixes gh-70

Author: kazuki43zoo

pom.xml

@@ -28,7 +28,7 @@
 
   <groupId>org.mybatis.scripting</groupId>
   <artifactId>mybatis-velocity</artifactId>
-  <version>2.1-SNAPSHOT</version>
+  <version>2.1.0-SNAPSHOT</version>
   <packaging>jar</packaging>
 
   <name>MyBatis Velocity</name>