chore: bump the version to 6.3.1 (#11937)

Author: tinayuangao

CHANGELOG.md

@@ -1,3 +1,20 @@
+<a name="6.3.1"></a>
+## [6.3.1 string-sole](https://github.com/angular/material2/compare/6.3.0...6.3.1) (2018-06-26)
+
+
+### Bug Fixes
+
+* **button-toggle:** emit change event when button is clicked ([#11886](https://github.com/angular/material2/issues/11886)) ([828b3c0](https://github.com/angular/material2/commit/828b3c0))
+* **button-toggle:** use native button and aria-pressed for button-toggle ([#10990](https://github.com/angular/material2/issues/10990)) ([b959e18](https://github.com/angular/material2/commit/b959e18))
+* **menu:** panel positions not changing if position is updated after first open ([#11707](https://github.com/angular/material2/issues/11707)) ([671ad82](https://github.com/angular/material2/commit/671ad82)), closes [#11668](https://github.com/angular/material2/issues/11668)
+* **overlay:** explicitly implement OverlayReference. ([#11824](https://github.com/angular/material2/issues/11824)) ([3e99c46](https://github.com/angular/material2/commit/3e99c46))
+* **progress-spinner:** create internal default to force animations to always be on ([#11462](https://github.com/angular/material2/issues/11462)) ([11f3993](https://github.com/angular/material2/commit/11f3993))
+* **select:** don't blur label when trigger is blurred while the panel is opened ([#11537](https://github.com/angular/material2/issues/11537)) ([6c9c3fe](https://github.com/angular/material2/commit/6c9c3fe))
+* **table:** use solid color for sorting arrow ([#11533](https://github.com/angular/material2/issues/11533)) ([d083d76](https://github.com/angular/material2/commit/d083d76)), closes [#11340](https://github.com/angular/material2/issues/11340)
+* **tree:** fix dynamic tree example and demo not closing children ([#11148](https://github.com/angular/material2/issues/11148)) [#11728](https://github.com/angular/material2/issues/11728) ([128e2a0](https://github.com/angular/material2/commit/128e2a0))
+
+
+
 <a name="6.3.0"></a>
 # [6.3.0 tourmaline-transom](https://github.com/angular/material2/compare/6.2.0...6.3.0) (2018-06-18)