Add a log message to the 'svn cp' in the release process.

git-svn-id: https://svn.apache.org/repos/asf/httpd/apreq/trunk@1903515 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/build/RELEASE b/build/RELEASE
index a55989c..efc2f37 100644
--- a/build/RELEASE
+++ b/build/RELEASE
@@ -4,10 +4,10 @@
 
 1. Create a realease branch:
 
-    svn cp https://svn.apache.org/repos/asf/httpd/apreq/trunk \
+    svn cp -m "Prepare for v2.17 release." \
+           https://svn.apache.org/repos/asf/httpd/apreq/trunk \
            https://svn.apache.org/repos/asf/httpd/apreq/branches/v2.17
 
-
 2. On the BRANCH
     Edit STATUS, marking the release date