README: Use rel_2_1_x for the staff client build ID

Per a suggestion from Martha Driscoll <driscoll@noblenet.org> to have it
match the release number - go halfway and at least match the release
numbering pattern.

Signed-off-by: Dan Scott <dscott@laurentian.ca>

diff --git a/README b/README
index daa87a8..39f00f8 100644 (file)
--- a/README
+++ b/README
@@ -160,7 +160,7 @@ Installation instructions:
 +
 [source, bash]
 ------------------------------------------------------------------------------
-make STAFF_CLIENT_STAMP_ID=rel_2_1 install
+make STAFF_CLIENT_STAMP_ID=rel_2_1_x install
 ------------------------------------------------------------------------------
 +
 2. The server portion of the staff client expects `http://hostname/xul/server`