doc: update go1.5.txt

Change-Id: I48b5f10d703dba48ec8e67c58d4276befafb5524
Reviewed-on: https://go-review.googlesource.com/10420Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/go1.5.txt

@@ -58,9 +58,11 @@ mime/quotedprintable: new package (https://golang.org/cl/5940 + others)
 net: add Source field to OpError (https://go-review.googlesource.com/9231)
 net: fix inconsistent errors (https://golang.org/cl/9236)
 net: add SocketConn, SocketPacketConn (https://golang.org/cl/9275)
+net: use Go's DNS resolver when system configuration permits (https://golang.org/cl/8945)
 net/http: support for setting trailers from a server Handler (https://golang.org/cl/2157)
 net/http: ignore the Unix epoch time in ServeContent (https://golang.org/cl/7915)
 net/http/cgi: fix REMOTE_ADDR, REMOTE_HOST, add REMOTE_PORT (https://golang.org/cl/4933)
+net/mail: adds AddressParser type (https://golang.org/cl/10392)
 net/smtp: add TLSConnectionState accessor (https://golang.org/cl/2151)
 os: add LookupEnv (https://golang.org/cl/9791)
 os/signal: add Ignore and Reset (https://golang.org/cl/3580)