Add change log

CHANGELOG.md

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+# Change Log
+
+## [2.1] - 2015-10-26
+
+### Added
+
+- MIT license
+- Autofocus on search query input ([PR#3](https://github.com/bbc2/porygon-ftp/pull/3)),
+  thanks [luc--](https://github.com/luc--)!
+
+## [2.0] - 2015-04-07
+
+### Added
+
+- Test environment with Docker
+
+### Changed
+
+- Fully rewrite Porygon with asyncio and SQLite
+
+## [1.0] - 2015-10-05
+
+### Added
+
+- FTP scanner, indexer and search engine with
+  [Whoosh](https://bitbucket.org/mchaput/whoosh/wiki/Home)
+
+[2.1]: https://github.com/bbc2/porygon-ftp/compare/v2.0...v2.1
+[2.0]: https://github.com/bbc2/porygon-ftp/compare/v1.0...v2.0
+[1.0]: https://github.com/bbc2/porygon-ftp/compare/2da993c2...v1.0