doc/go1.3: note a couple more crypto changes.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/68600043

doc/go1.3.txt

@@ -10,4 +10,6 @@ cmd/go, go/build: support .m files (CL 60590044)
 unicode: upgrade from Unicode 6.2.0 to 6.3.0 (CL 65400044)
 runtime/debug: add SetPanicOnFault (CL 66590044)
 crypto/tls: ServerName or InsecureSkipVerify (CL 67010043)
+crypto/tls: report TLS version in ConnectionState (CL 68250043)
+crypto/x509: support CSRs (CL 49830048)
 cmd/go: add -exec to 'go run' and 'go test' (CL 68580043)