doc: document Go 1.3.2

LGTM=r
R=r, rsc, iant, agl
https://golang.org/cl/142650045

doc/devel/release.html

@@ -27,6 +27,11 @@ go1.3.1 (released 2014/08/13) includes bug fixes to the compiler and the <code>r
 See the <a href="//code.google.com/p/go/source/list?name=release-branch.go1.3&r=073fc578434bf3e1e22749b559d273c8da728ebb">change history</a> for details.
 </p>
 
+<p>
+go1.3.2 (released 2014/09/25) includes bug fixes to cgo and the crypto/tls packages.
+See the <a href="//code.google.com/p/go/source/list?name=release-branch.go1.3&r=go1.3.2">change history</a> for details.
+</p>
+
 <h2 id="go1.2">go1.2 (released 2013/12/01)</h2>
 
 <p>