[release-branch.go1.4] doc: document go1.4.3

Change-Id: Ib1bfe4038e2b125a31acd9ff7772e462b0a6358f
Reviewed-on: https://go-review.googlesource.com/14852
Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-on: https://go-review.googlesource.com/14853
diff --git a/doc/devel/release.html b/doc/devel/release.html
index 5a1a747..0ce2b2e 100644
--- a/doc/devel/release.html
+++ b/doc/devel/release.html
@@ -31,6 +31,11 @@
 See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.4.2">Go 1.4.2 milestone on our issue tracker</a> for details.
 </p>
 
+<p>
+go1.4.3 (released 2015/09/22) includes security fixes to the <code>net/http</code> package and bug fixes to the <code>runtime</code> package.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.4.3">Go 1.4.3 milestone on our issue tracker</a> for details.
+</p>
+
 <h2 id="go1.3">go1.3 (released 2014/06/18)</h2>
 
 <p>