Add 2.1.4 to ReleaseNotes index

Change-Id: I294c52e571a13798d94622469d87e979319f70ae
Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/ReleaseNotes/index.txt b/ReleaseNotes/index.txt
index bc9feb8..bd98667 100644
--- a/ReleaseNotes/index.txt
+++ b/ReleaseNotes/index.txt
@@ -4,6 +4,7 @@
 [[2_1]]
 Version 2.1.x
 -------------
+* link:ReleaseNotes-2.1.4.html[2.1.4]
 * link:ReleaseNotes-2.1.3.html[2.1.3]
 * link:ReleaseNotes-2.1.2.5.html[2.1.2.5]
 * link:ReleaseNotes-2.1.2.4.html[2.1.2.4]