internal/history: document Go 1.15.1 and Go 1.14.8

Change-Id: I0e319e10f897c1355ce0e24e36c3b6d80ed12419
Reviewed-on: https://go-review.googlesource.com/c/website/+/252197
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/internal/history/release.go b/internal/history/release.go
index 33000f1..c151422 100644
--- a/internal/history/release.go
+++ b/internal/history/release.go
@@ -34,12 +34,14 @@
 	{1, 15, 1}: {
 		Date:     Date{2020, 9, 1},
 		Security: true,
-		Future:   true,
+
+		Packages: []string{"net/http/cgi", "net/http/fcgi"},
 	},
 	{1, 14, 8}: {
 		Date:     Date{2020, 9, 1},
 		Security: true,
-		Future:   true,
+
+		Packages: []string{"net/http/cgi", "net/http/fcgi"},
 	},
 
 	{1, 15, 0}: {
@@ -49,11 +51,13 @@
 	{1, 14, 7}: {
 		Date:     Date{2020, 8, 6},
 		Security: true,
+
 		Packages: []string{"encoding/binary"},
 	},
 	{1, 13, 15}: {
 		Date:     Date{2020, 8, 6},
 		Security: true,
+
 		Packages: []string{"encoding/binary"},
 	},