Prepare for 2.0.0-rc.3 release (#462)
Prepare for 2.0.0-rc.3 release (#462)

* Update CHANGELOG for rc3 release. (#459)

* fix changelog for `noAccessor` to point to pull request, not issue

* update CHANGELOG with more merged PRs

lit/lit-element,Polymer/lit-element,Polymer/lit-element,lit/lit-element,Polymer/lit-element,lit/lit-element