Add v3.28.0-beta.1 to CHANGELOG
Add v3.28.0-beta.1 to CHANGELOG

(cherry picked from commit 916e1041d8ed38f4dc8cff0a7a9b3b4013659c6c)

elwayman02/ember.js,sly7-7/ember.js,mixonic/ember.js,mixonic/ember.js,stefanpenner/ember.js,elwayman02/ember.js,knownasilya/ember.js,knownasilya/ember.js,sly7-7/ember.js,knownasilya/ember.js,sly7-7/ember.js,mixonic/ember.js,emberjs/ember.js,tildeio/ember.js,emberjs/ember.js,emberjs/ember.js,tildeio/ember.js,stefanpenner/ember.js,stefanpenner/ember.js,elwayman02/ember.js,tildeio/ember.js,elwayman02/ember.js