Upgrade to mybatis.3.5.5

Fixes gh-81

Author: kazuki43zoo

pom.xml

@@ -85,7 +85,7 @@
     <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
-      <version>3.5.4</version>
+      <version>3.5.5</version>
     </dependency>
     <dependency>
       <groupId>org.freemarker</groupId>