add changelog

CHANGELOG.md

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+# Changelog
+
+## 2.2.3 - 2016-05-01
+
+- Improve compatibility with phpBB 3.1.x and 3.2.x
+- Added support for phpBB 3.2's s9e/textformatter utilities
+- Added missing ALT attribute to fallback no-avatar image in HTML
+- Refactored topic preview's trim tools
+- Improved TWIG code
+- Added Bulgarian Translation
+- Added Hungarian Translation
+
+## 2.2.2 - 2015-09-14
+
+- Improved avatar handling including an issue where avatars would not load in phpBB 3.1.7
+- Support lazy loading of avatars
+- Improved BBCode handling
+- Completed transition to TWIG template syntax
+- Added Chinese Translation
+
+## 2.2.1 - 2015-02-09
+
+- Converted to TWIG template syntax
+- Updated support for Top Five extension
+- Updated French Translation
+- Added Russian Translation
+- Added Turkish Translation
+- Added Swedish Translation
+- Added Croatian Translation
+- Added Arabic Translation
+
+## 2.2.0 - 2015-01-30
+
+- Improved handling of nested bbcodes
+- Improved theme handling (fallback to No theme if expected theme is missing)
+- Removed version number displayed in ACP module title
+- Major internal coding revisions for improving code quality
+
+## 2.1.0-RC1 - 2014-12-03
+
+- Fix issue where recursive BBCode stripping could fail
+- Fix some issues with broken avatars
+- Fix handling of missing CSS theme files
+- Add support for Top Five extension
+- Use UTF8 chars in language files
+- Various code refactoring
+
+## 2.1.0-b3 - 2014-07-12
+
+- Updated for compatibility with phpBB 3.1.0-RC2
+
+## 2.1.0-b2 - 2014-06-23
+
+- Avatar icons keep their original proportions when scaled to fit
+- Refactored the codebase along with minor improvements and updates
+- Complete Persian translation
+- Ensure Similar Topics is installed on phpBB 3.1.0-b4 or later
+- Switched to phpBB test framework
+- Added additional test coverage of the codebase
+
+## 2.1.0-b1 - 2014-06-06
+
+- Ported from MOD to the new Extension format for phpBB 3.1