[MSHARED-444] Make the optional dependency (commons-io) to a usual dependency

git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@1708015 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 08b74bb..35fb01c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -79,7 +79,6 @@
       <groupId>commons-io</groupId>
       <artifactId>commons-io</artifactId>
       <version>2.4</version>
-      <optional>true</optional>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>