chore(release): 9.0.0

Author: ocombe

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
+
+<a name="9.0.0"></a>
+# [9.0.0](https://github.com/ngx-translate/core/compare/v8.0.0...v9.0.0) (2017-11-23)
+
+
+### Bug Fixes
+
+* **ngx-translate:** updated build to fix "Unexpected token import errors" ([9add703](https://github.com/ngx-translate/core/commit/9add703)), closes [#724](https://github.com/ngx-translate/core/issues/724) [#581](https://github.com/ngx-translate/core/issues/581)
+
+
+### BREAKING CHANGES
+
+* **ngx-translate:** I've finally taken the time to update the entire build system for the library using ng-packagr instead of my own custom webpack config.
+I've also added support for rxjs lettable operators at the same time, it means that I've been forced to add a peer dependency for RxJS >= 5.5.2. and I've updated the minimum Angular version to >=5.0.0.
+The library should be much smaller (from ~80ko to ~20ko for the umd bundle!) and it now supports ES2015 to be tree-shackable which might drop the size even more. 
+It should also fix the "Unexpected token import errors" that some people were experiencing.
+Unfortunately this might be breaking people since the peer dependency have changed and that's why it's a new major version.