Docs: Introduce changelog

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CHANGELOG.md

+# Changelog
+
+## Unreleased
+
+### Breaking Changes
+
+None
+
+### Added
+
+None
+
+### Fixed
+
+None
+
+## 0.3.2 (2016-08-02)
+
+### Breaking Changes
+
+None
+
+### Added
+
+- [#37](https://github.com/minad/mimemagic/pull/37)
+  A convenient way to get all possible mime types by magic
+
+### Fixed
+
+- [#40](https://github.com/minad/mimemagic/pull/40),
+  [#41](https://github.com/minad/mimemagic/pull/41) 
+  Performance improvements
+- [#38](https://github.com/minad/mimemagic/pull/38) 
+  Updated to shared-mime-info 1.6
+
+## 0.3.1 (2016-01-04)
+
+No release notes yet. Contributions welcome.
+
+## 0.3.0 (2015-03-25)
+
+No release notes yet. Contributions welcome.
+
+## 0.2.1 (2013-07-29)
+
+No release notes yet. Contributions welcome.
+
+## 0.2.0 (2012-10-19)
+
+No release notes yet. Contributions welcome.
+
+## 0.1.9 (2012-09-20)
+
+No release notes yet. Contributions welcome.
+
+## 0.1.8 (2009-05-08)
+
+No release notes yet. Contributions welcome.
+
+## 0.1.7 (2009-05-08)
+
+No release notes yet. Contributions welcome.
+
+## 0.1.5 (2009-05-08)
+
+No release notes yet. Contributions welcome.
+
+## 0.1.4 (2009-05-08)
+
+No release notes yet. Contributions welcome.
+
+## 0.1.3 (2009-05-08)
+
+No release notes yet. Contributions welcome.
+
+## 0.1.2 (2009-05-08)
+
+No release notes yet. Contributions welcome.
+
+## 0.1.1 (2009-05-08)
+
+No release notes yet. Contributions welcome.
+
+