message: docs: add changelog for 5.2.0-rc.0
diff: +<a name="5.2.0-rc.0"></a>
  +# [5.2.0-rc.0](https://github.com/angular/angular/compare/5.2.0-beta.1...5.2.0-rc.0) (2018-01-04)
  +
  +
  +### Bug Fixes
  +
  +* **animations:** avoid infinite loop with multiple blocked sub triggers ([#21119](https://github.com/angular/angular/issues/21119)) ([86a36ea](https://github.com/angular/angular/commit/86a36ea))
  +* **animations:** renaming issue with DOMAnimation. ([#21125](https://github.com/angular/angular/issues/21125)) ([871ece6](https://github.com/angular/angular/commit/871ece6))
  +* **common:** handle JS floating point errors in percent pipe ([#20329](https://github.com/angular/angular/issues/20329)) ([07b81ae](https://github.com/angular/angular/commit/07b81ae)), closes [#20136](https://github.com/angular/angular/issues/20136)
  +* **language-service:** ignore null metadatas ([#20557](https://github.com/angular/angular/issues/20557)) ([3e47ea2](https://github.com/angular/angular/commit/3e47ea2)), closes [#20260](https://github.com/angular/angular/issues/20260)
  +* **router:** fix wildcard route with lazy loaded module (again) ([#18139](https://github.com/angular/angular/issues/18139)) ([5ba1cf1](https://github.com/angular/angular/commit/5ba1cf1)), closes [#13848](https://github.com/angular/angular/issues/13848)
  +
  +
  +
  <a name="5.1.3"></a>
  ## [5.1.3](https://github.com/angular/angular/compare/5.1.2...5.1.3) (2018-01-03)
  