Add Changelog file to make it more transparent what has changed in a …

…release

Changelog.md

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+# Changelog
+
+All notable changes to this project will be documented in this file, in reverse chronological order by release.
+
+## 0.6.0
+
+### Added
+
+- [#18](https://github.com/bitExpert/ng2-combobox/pull/18) Suggested dropdown items were not matching user's input
+- [#17](https://github.com/bitExpert/ng2-combobox/pull/17) Configurable non case-sensitive search
+- [#16](https://github.com/bitExpert/ng2-combobox/pull/16) Optionally display "No Matches" text in dropdown
+- [#14](https://github.com/bitExpert/ng2-combobox/pull/14) Hide IE's clear button from input control
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- Nothing.