Releases history update

Add DragonFly 5.8.1, OpenBSD 6.7, FreeBSD 11.4, DragonFly 5.8.2,
DragonFly 5.8.3, OpenBSD 6.8, NetBSD 9.1, FreeBSD 13.0, OpenBSD 6.9.

Approved by: re@ (delphij@)

(cherry picked from commit f0c914baacc7f0eefe9ff47ed04aeb500b7bdcd5)
(cherry picked from commit 04324346c979f187ef0ecd7c70c0f7cc65b30e2d)