Add v4.5.0-beta.2 to CHANGELOG
Add v4.5.0-beta.2 to CHANGELOG

(cherry picked from commit 4443f5e554bf6353b7f4a2cda4a842bd47fd75ad)

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