internal/history: document Go 1.14.7 and Go 1.13.15

Change-Id: I573bc8c9278181c1d6651946b1661bac419520c5
Reviewed-on: https://go-review.googlesource.com/c/website/+/247183
Run-TryBot: Katie Hockman <katie@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/internal/history/release.go b/internal/history/release.go
index b818bf6..c9da099 100644
--- a/internal/history/release.go
+++ b/internal/history/release.go
@@ -34,12 +34,12 @@
 	{1, 14, 7}: {
 		Date:     Date{2020, 8, 6},
 		Security: true,
-		Future:   true,
+		Packages: []string{"encoding/binary"},
 	},
 	{1, 13, 15}: {
 		Date:     Date{2020, 8, 6},
 		Security: true,
-		Future:   true,
+		Packages: []string{"encoding/binary"},
 	},
 
 	{1, 14, 6}: {