More 1.8.0 notes updates: add latest merged PRs (#4168)
More 1.8.0 notes updates: add latest merged PRs (#4168)

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