update commons-io (#34)


* deps: try just io
diff --git a/pom.xml b/pom.xml
index ce41830..5fa5ee1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -246,7 +246,7 @@
     <dependency>
       <groupId>commons-io</groupId>
       <artifactId>commons-io</artifactId>
-      <version>2.5</version>
+      <version>2.6</version>
       <!-- scope>test</scope> Required by PMD transitively. -->
     </dependency>
     <dependency>