Upgrade to mybatis 3.5.1

Fixes gh-315

Author: kazuki43zoo

pom.xml

@@ -67,7 +67,7 @@
   </distributionManagement>
 
   <properties>
-    <mybatis.version>3.5.0</mybatis.version>
+    <mybatis.version>3.5.1</mybatis.version>
     <mybatis-spring.version>2.0.0</mybatis-spring.version>
     <spring-boot.version>2.0.9.RELEASE</spring-boot.version>
   </properties>