doc: document Go 1.10.4

Change-Id: I7383e7d37a71defcad79fc662c4b4d1ca02189d1
Reviewed-on: https://go-review.googlesource.com/131336Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/devel/release.html

@@ -57,6 +57,14 @@ 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>
 
+<p>
+go1.10.4 (released 2018/08/24) includes fixes to the go command, linker, and the
+<code>net/http</code>, <code>mime/multipart</code>, <code>ld/macho</code>,
+<code>bytes</code>, and <code>strings</code> packages.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.10.4">Go
+1.10.4 milestone</a> on our issue tracker for details.
+</p>
+
 <h2 id="go1.9">go1.9 (released 2017/08/24)</h2>
 
 <p>