doc/go1.4.txt: add support for ALPN

LGTM=minux
R=r, agl, minux
CC=golang-codereviews
https://golang.org/cl/121340043

doc/go1.4.txt

@@ -7,6 +7,7 @@ Please keep the list sorted (as in sort.Strings of the lines).
 
 spec: permit for range x (CL 104680043)
 
+crypto/tls: add support for ALPN (RFC 7301) (CL 108710046)
 encoding/gob: remove unsafe (CL 102680045)
 misc: deleted editor support; refer to https://code.google.com/p/go-wiki/wiki/IDEsAndTextEditorPlugins instead (CL 105470043)
 os: implement symlink support for windows (CL 86160044)