docs(Changelog): update Changelog to beta.2

Author: jeffbcross

CHANGELOG.md

@@ -1,3 +1,16 @@
+<a name="2.0.0-beta.2"></a>
+# [2.0.0-beta.2](https://github.com/angular/angularfire2/compare/2.0.0-beta.1...v2.0.0-beta.2) (2016-06-22)
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+### Bug Fixes
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+* **auth:** check for null user before attempting to transform ([981f0f5](https://github.com/angular/angularfire2/commit/981f0f5)), closes [#251](https://github.com/angular/angularfire2/issues/251)
+* **auth:** correctly emit anonymous auth state ([51c8caa](https://github.com/angular/angularfire2/commit/51c8caa))
+* **auth:** make sure onAuth runs in Angular zone ([d9a6ae7](https://github.com/angular/angularfire2/commit/d9a6ae7)), closes [#231](https://github.com/angular/angularfire2/issues/231)
+* **build:** downgrade to stable TS version to fix d.ts ([664a156](https://github.com/angular/angularfire2/commit/664a156)), closes [#250](https://github.com/angular/angularfire2/issues/250)
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 # AngularFire2 2.0.0-beta.1
 
 This release updates AngularFire to the Firebase 3 SDK. There are a few breaking changes, most notably in how