[2.7.0]: Updates CHANGELOG
[2.7.0]: Updates CHANGELOG

blg-andreasbraun/ProcedureKit,ProcedureKit/ProcedureKit,danthorpe/Operations,ProcedureKit/ProcedureKit,blg-andreasbraun/ProcedureKit,cezarywojcik/Operations,ProcedureKit/ProcedureKit,blg-andreasbraun/Operations,blg-andreasbraun/ProcedureKit,danthorpe/Operations,blg-andreasbraun/Operations,danthorpe/Operations,blg-andreasbraun/Operations,cezarywojcik/Operations,cezarywojcik/Operations