Upgrade to hsqldb 2.5.0

Fixes gh-68

Author: kazuki43zoo

pom.xml

@@ -109,7 +109,7 @@
     <dependency>
       <groupId>org.hsqldb</groupId>
       <artifactId>hsqldb</artifactId>
-      <version>2.4.1</version>
+      <version>2.5.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>