Updates Changelog for 4.5.0 release (#908)
Updates Changelog for 4.5.0 release (#908)

* Updates Changelog for 4.5.0 release

* Addresses comments

firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk