Create CHANGELOG.md

Author: dimirc

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+## [Unreleased][unreleased]
+### Fixed
+- Scroll to selected item [#976](https://github.com/angular-ui/ui-select/issues/976)
+
+### Added
+- Can use object as source with (key,value) syntax [#1208](https://github.com/angular-ui/ui-select/pull/1208) 
+- CHANGELOG.md file created
+
+[unreleased]: https://github.com/angular-ui/ui-select/compare/v0.12.1...HEAD