Add IPv6 note to changelog
Add IPv6 note to changelog

akihiro17/dalli,freeatnet/dalli,mcka1n/dalli,eagletmt/dalli,exact/dalli,indirect/dalli,jaxi/dalli,mperham/dalli,wjordan/dalli,petergoldstein/dalli,eileencodes/dalli,nitinstp23/dalli,leonid-shevtsov/dalli,dannyfallon/dalli,dtakahas/dalli,hirocaster/dalli,vipulnsward/dalli,mumoshu/dalli,petergoldstein/dalli