message: docs: add changelog for 4.3.4
diff: +<a name="4.3.4"></a>
  +## [4.3.4](https://github.com/angular/angular/compare/4.3.3...4.3.4) (2017-08-10)
  +
  +### Bug Fixes
  +
  +* **animations:** revert container/queried animations accordingly during cancel ([#18516](https://github.com/angular/angular/issues/18516)) ([5a165eb](https://github.com/angular/angular/commit/5a165eb))
  +* **animations:** support persisting dynamic styles within animation states ([#18468](https://github.com/angular/angular/issues/18468)) ([e0660b1](https://github.com/angular/angular/commit/e0660b1)), closes [#18423](https://github.com/angular/angular/issues/18423) [#17505](https://github.com/angular/angular/issues/17505)
  +* **benchpress:** compile cleanly with TS 2.4 ([#18455](https://github.com/angular/angular/issues/18455)) ([5afc7ab](https://github.com/angular/angular/commit/5afc7ab))
  +* **compiler:** cleanly compile with TypeScript 2.4 ([#18456](https://github.com/angular/angular/issues/18456)) ([5e4054b](https://github.com/angular/angular/commit/5e4054b))
  +* **compiler:** ignore [@import](https://github.com/import) in multi-line css ([#18452](https://github.com/angular/angular/issues/18452)) ([e7e7622](https://github.com/angular/angular/commit/e7e7622)), closes [#18038](https://github.com/angular/angular/issues/18038)
  +
  +
  <a name="5.0.0-beta.3"></a>
  # [5.0.0-beta.3](https://github.com/angular/angular/compare/5.0.0-beta.2...5.0.0-beta.3) (2017-08-09)
  @@ -81,17 +93,14 @@ DEPRECATION:
  * **router:** add events tracking activation of individual routes ([49cd851](https://github.com/angular/angular/commit/49cd851))
  -
  <a name="4.3.3"></a>
  ## [4.3.3](https://github.com/angular/angular/compare/4.3.2...4.3.3) (2017-08-02)
  -
  ### Bug Fixes
  * **compiler:** fix for element needing implicit parent placed in top-level ng-container ([f5cbc2e](https://github.com/angular/angular/commit/f5cbc2e)), closes [#18314](https://github.com/angular/angular/issues/18314)
  -
  <a name="5.0.0-beta.1"></a>
  # [5.0.0-beta.1](https://github.com/angular/angular/compare/5.0.0-beta.0...5.0.0-beta.1) (2017-07-27)
  