[MINOR] Update expected extension on release script
diff --git a/dev/release-build.sh b/dev/release-build.sh
index c9073b1..65429e3 100755
--- a/dev/release-build.sh
+++ b/dev/release-build.sh
@@ -254,8 +254,8 @@
     if [ -z "$DRY_RUN" ]; then
         svn co $RELEASE_STAGING_LOCATION svn-bahir-flink
         mkdir -p svn-bahir-flink/$RELEASE_VERSION-$RELEASE_RC
-        cp bahir-flink/distribution/target/*.tar.gz svn-bahir-flink/$RELEASE_VERSION-$RELEASE_RC/
-        cp bahir-flink/distribution/target/*.zip    svn-bahir-flink/$RELEASE_VERSION-$RELEASE_RC/
+        cp bahir-flink/distribution/target/*.tgz svn-bahir-flink/$RELEASE_VERSION-$RELEASE_RC/
+        cp bahir-flink/distribution/target/*.zip svn-bahir-flink/$RELEASE_VERSION-$RELEASE_RC/
 
         cd svn-bahir-flink/$RELEASE_VERSION-$RELEASE_RC/
         rm -f *.asc