Upgrade to mybatis 3.5.2

Fixes gh-62

Author: kazuki43zoo

pom.xml

@@ -83,7 +83,7 @@
     <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
-      <version>3.5.1</version>
+      <version>3.5.2</version>
     </dependency>
     <dependency>
       <groupId>org.freemarker</groupId>