design: remove suggestion to mail directly from CoC proposal

Update golang/go#13073

Change-Id: Id5c140d0835afa02ee6f32079feaaae07a33b3f8
Reviewed-on: https://go-review.googlesource.com/17017
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/design/13073-code-of-conduct.md b/design/13073-code-of-conduct.md
index 75ee271..9994876 100644
--- a/design/13073-code-of-conduct.md
+++ b/design/13073-code-of-conduct.md
@@ -4,8 +4,6 @@
 
 Last updated: 17 November 2015
 
-*Please send comments or questions directly to <adg@golang.org>.*
-
 ## Abstract
 
 This proposal specifies a Code of Conduct for the Go community.