colornames: update SVG 1.1 spec URL

The Scalable Vector Graphics (SVG) 1.1 specification URL has changed.
The old URL, https://www.w3.org/TR/SVG/, now hosts the SVG 2 spec.
SVG 1.1 spec has moved to https://www.w3.org/TR/SVG11/.

This change makes this package go generate successfully with no diff.

Change-Id: Ifa788b1bb47748610b3adc0ac96692c00bcb3158
Reviewed-on: https://go-review.googlesource.com/c/148566
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/colornames/gen.go b/colornames/gen.go
index d46e968..49e9ad9 100644
--- a/colornames/gen.go
+++ b/colornames/gen.go
@@ -5,7 +5,7 @@
 // +build ignore
 
 // This program generates table.go from
-// http://www.w3.org/TR/SVG/types.html#ColorKeywords
+// https://www.w3.org/TR/SVG11/types.html#ColorKeywords
 package main
 
 import (
@@ -165,7 +165,7 @@
 	fmt.Fprintln(w, ")")
 }
 
-const url = "http://www.w3.org/TR/SVG/types.html"
+const url = "https://www.w3.org/TR/SVG11/types.html"
 
 func main() {
 	res, err := http.Get(url)