trivial: baseDirectory not specified in -bin archive

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/fileupload/trunk@1461194 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/assembly/bin.xml b/src/main/assembly/bin.xml
index d28d5c7..d536d6e 100644
--- a/src/main/assembly/bin.xml
+++ b/src/main/assembly/bin.xml
@@ -23,6 +23,7 @@
     <format>tar.gz</format>
     <format>zip</format>
   </formats>
+  <baseDirectory>${project.build.finalName}-bin</baseDirectory>
   <includeSiteDirectory>true</includeSiteDirectory>
   <fileSets>
     <fileSet>