design/12302: withdraw proposal

Change-Id: I2f49764c6f0a1f26fcb17dc868f1d399367f5ef1
Reviewed-on: https://go-review.googlesource.com/17322
Reviewed-by: Dave Cheney <dave@cheney.net>
diff --git a/design/12302-release-proposal.md b/design/12302-release-proposal.md
index 39374a8..13344b7 100644
--- a/design/12302-release-proposal.md
+++ b/design/12302-release-proposal.md
@@ -2,7 +2,9 @@
 
 Author: Dave Cheney &lt;dave@cheney.net&gt;
 
-Last updated: 15 September 2015
+Last updated: 03 December 2015
+
+Status: Withdrawn
 
 Discussion at https://golang.org/issue/12302.