update(changelog): added information on API improvements

CHANGELOG.md

@@ -27,18 +27,29 @@ v0.6.0-rc1 releases the following changes:
 * **slider:** update discrete slider thumb text while dragging ([2877585e](https://github.com/angular/material/commit/2877585e6dbbf44199428c59601e954a3b31f1e1), closes [#622](https://github.com/angular/material/issues/622))
 * **themes:** bring blue, red, and green colors up to latest spec ([de3ff4b8](https://github.com/angular/material/commit/de3ff4b800955d204a8cce504332bd8d52f5b2cf))
 
-
 #### Features
 
-* **bottomSheet:** focus the first available button on open ([768cc098](https://github.com/angular/material/commit/768cc098fdc4b09e1c5f3faab526a7ed9e324702), closes [#571](https://github.com/angular/material/issues/571))
-* **interimElement:** allow options.parent to be a selector ([342051e0](https://github.com/angular/material/commit/342051e0af2ca5cd42555b30a47249006d6228b7), closes [#640](https://github.com/angular/material/issues/640))
 * **layout:**
   * add new layout system ([d51a44c5](https://github.com/angular/material/commit/d51a44c5629763cb52c61df39881ef665448734e))
   * add `layout-wrap` attribute to set flex-wrap to wrap ([4f755eab](https://github.com/angular/material/commit/4f755eab67046864e61eba8f4345688bed461863), closes [#634](https://github.com/angular/material/issues/634))
+* **styles:** add 'swift' css transitions to all components according to spec ([15bb142c](https://github.com/angular/material/commit/15bb142c0aa53e5fcfa421526a5fb0ab1c3e9b1e), closes [#611](https://github.com/angular/material/issues/611))
 * **mdThemingProvider:** add alwaysWatchTheme options, fix docs ([0a404088](https://github.com/angular/material/commit/0a4040886f288ed22fd0fef182eace13150cd732))
 * **radioGroup:** add up/down arrow navigation ([367e47db](https://github.com/angular/material/commit/367e47dbabf638154cd8155d9132f01aa05cd81b), closes [#538](https://github.com/angular/material/issues/538))
-* **styles:** add 'swift' css transitions to all components according to spec ([15bb142c](https://github.com/angular/material/commit/15bb142c0aa53e5fcfa421526a5fb0ab1c3e9b1e), closes [#611](https://github.com/angular/material/issues/611))
 * **tabs:** add accessibility links between tabs and content ([5d3bab56](https://github.com/angular/material/commit/5d3bab566ec71ff9f4a65faad7ef2674cd04c1b9))
+* **bottomSheet:** focus the first available button on open ([768cc098](https://github.com/angular/material/commit/768cc098fdc4b09e1c5f3faab526a7ed9e324702), closes [#571](https://github.com/angular/material/issues/571))
+* **interimElement:** allow options.parent to be a selector ([342051e0](https://github.com/angular/material/commit/342051e0af2ca5cd42555b30a47249006d6228b7), closes [#640](https://github.com/angular/material/issues/640))
+* **mdDialog:** enhance show API with *confirm()* and *alert()* builder functions. ([12b8cbc06](https://github.com/angular/material/commit/12b8cbc06065669df6b22b9bdbb6764398ff26fb)
+> See [Demos](https://material.angularjs.org/#/demo/material.components.dialog) JavaScript source
+>```js
+$mdDialog.show(
+      $mdDialog.alert()
+        .title('This is an alert title')
+        .content('You can specify some description text in here.')
+        .ariaLabel('Password notification')
+        .ok('Got it!')
+        .targetEvent(ev)
+    );
+```
 
 
 #### Breaking Changes