Upgrade to mybatis-spring 2.0.6

Fixes gh-511

Author: kazuki43zoo

pom.xml

@@ -68,7 +68,7 @@
 
   <properties>
     <mybatis.version>3.5.6</mybatis.version>
-    <mybatis-spring.version>2.0.6-SNAPSHOT</mybatis-spring.version>
+    <mybatis-spring.version>2.0.6</mybatis-spring.version>
     <mybatis-freemarker.version>1.2.2</mybatis-freemarker.version>
     <mybatis-velocity.version>2.1.0</mybatis-velocity.version>
     <mybatis-thymeleaf.version>1.0.2</mybatis-thymeleaf.version>