release notes for 1.8.2 (#4480)
release notes for 1.8.2 (#4480)

Update the notes and set the date to tomorrow.

See #4479

Signed-off-by: Miek Gieben <00b357f94cf3a1145a32703fb42e2d80418ab806@miek.nl>
chrisohaver/coredns,coredns/coredns,yongtang/coredns