internal/history: add Go 1.17

Change-Id: Idbb89a88af787472e48bbc3f437462842156af3f
Reviewed-on: https://go-review.googlesource.com/c/website/+/342483
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Website-Publish: DO NOT USE <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

internal/history/release.go

@@ -14,6 +14,9 @@ import "golang.org/x/website/internal/backport/html/template"
 //
 // The table is sorted by date, breaking ties with newer versions first.
 var Releases = []*Release{
+	{
+		Date: Date{2021, 8, 16}, Version: Version{1, 17, 0},
+	},
 	{
 		Date: Date{2021, 8, 5}, Version: Version{1, 16, 7},
 		CustomSummary: `includes a security fix to the <code>net/http/httputil</code> package,