Add v4.0.0-beta.1 to CHANGELOG
Add v4.0.0-beta.1 to CHANGELOG

(cherry picked from commit 8e1dde524457719c45ded9ef183afc4940653fff)

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