doc: document Go 1.10.3

Change-Id: Ifc774bb9267baa773e91c617204329d3e04bd4b7
Reviewed-on: https://go-review.googlesource.com/116363Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

doc/devel/release.html

@@ -48,6 +48,15 @@ See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.10.2">Go
 1.10.2 milestone</a> on our issue tracker for details.
 </p>
 
+<p>
+go1.10.3 (released 2018/06/05) includes fixes to the go command, and the
+<code>crypto/tls</code>, <code>crypto/x509</code>, and <code>strings</code> packages.
+In particular, it adds <a href="https://go.googlesource.com/go/+/d4e21288e444d3ffd30d1a0737f15ea3fc3b8ad9">
+minimal support to the go command for the vgo transition</a>.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.10.3">Go
+1.10.3 milestone</a> on our issue tracker for details.
+</p>
+
 <h2 id="go1.9">go1.9 (released 2017/08/24)</h2>
 
 <p>