support for XZ compression format submitted by Lasse Collin.  COMPRESS-156

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/compress/trunk@1196665 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 9791b2e..52d266d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -56,6 +56,11 @@
       <version>4.10</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.tukaani</groupId>
+      <artifactId>xz</artifactId>
+      <version>1.0</version>
+    </dependency>
   </dependencies>
 
   <developers>