message: docs: release notes for the v9.0.0-rc.13 release
diff: +<a name="9.0.0-rc.13"></a>
  +# [9.0.0-rc.13](https://github.com/angular/angular/compare/9.0.0-rc.12...9.0.0-rc.13) (2020-02-01)
  +
  +
  +### Bug Fixes
  +
  +* **compiler-cli:** add `sass` as a valid css preprocessor extension ([#35052](https://github.com/angular/angular/issues/35052)) ([7f96fbb](https://github.com/angular/angular/commit/7f96fbb))
  +* should also allow subclass Promise without Symbol.species ([#34533](https://github.com/angular/angular/issues/34533)) ([0de632a](https://github.com/angular/angular/commit/0de632a))
  +* **common:** http/testing expectOne lists the received requests if no matches ([#27005](https://github.com/angular/angular/issues/27005)) ([c7f0c01](https://github.com/angular/angular/commit/c7f0c01)), closes [#18013](https://github.com/angular/angular/issues/18013)
  +* **common:** remove extra & in http params ([#34896](https://github.com/angular/angular/issues/34896)) ([bd8605a](https://github.com/angular/angular/commit/bd8605a))
  +
  +
  +### Features
  +
  +* **ngcc:** automatically clean outdated ngcc artifacts ([#35079](https://github.com/angular/angular/issues/35079)) ([ae0df83](https://github.com/angular/angular/commit/ae0df83)), closes [#35082](https://github.com/angular/angular/issues/35082)
  +
  +
  +
  <a name="9.0.0-rc.12"></a>
  # [9.0.0-rc.12](https://github.com/angular/angular/compare/9.0.0-rc.11...9.0.0-rc.12) (2020-01-30)
  