fix reported by Luc: the checkstyle-suppressions.xml file is not included in the source distribution so when rebuilding from the source archive triggers many checkstyle errors in the report.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/digester/trunk@1189057 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/assembly/src.xml b/src/main/assembly/src.xml
index 87da6a3..7f65800 100644
--- a/src/main/assembly/src.xml
+++ b/src/main/assembly/src.xml
@@ -29,6 +29,7 @@
         <include>NOTICE*</include>
         <include>pom.xml</include>
         <include>RELEASE-NOTES*</include>
+        <include>checkstyle-suppressions.xml</include>
       </includes>
     </fileSet>
     <fileSet>