add changelog

Author: xalopp

CHANGELOG.md

@@ -0,0 +1,37 @@
+# Changelog
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [2.0.0] - 2017-12-18
+### Added
+- `MO4.Arrays.ArrayDoubleArrowAlignment`
+- `MO4.Arrays.MultiLineArray`
+- `Generic.Arrays.ArrayIndent`
+- `Squiz.WhiteSpace.OperatorSpacing`
+- The behaviour of `MO4.Formatting.AlphabeticalUseStatements` can be configured with the property `order`.
+  Possible values are: `dictionary`, `string`, `string-locale` or `string-case-insensitive`.
+- Static code analysis with PHPStan.
+- Various cloud based code quality tools like: Scrutinizer CI, codecov.io, ...
+
+### Changed
+- PHPCS version 3.2.0 or later is required.
+- Code complies to PHPCS coding standard version 3.2.0.
+- Default ordering of `MO4.Formatting.AlphabeticalUseStatements` is now `dictionary` instead of `string`.
+- Updates and fixes for class documentation.
+- Improve testing and code coverage.
+- Unknown test files will not trigger wrong type exceptions anymore, but report decent error messages with `RuntimeException`.
+- Many fixes and stability improvements.
+
+### Removed
+- `MO4.Formatting.ArrayAlignmentUnit`
+  - replaced by `MO4.Arrays.ArrayDoubleArrowAlignment` and `MO4.Arrays.MultiLineArray`.
+- `MO4.Formatting.UseArrayShortTag`
+  - replaced by `Generic.Arrays.DisallowLongArray`.
+- Dead code from `MO4.Strings.VariableInDoubleQuotedString`.
+
+## [1.0.0] - 2017-11-20
+### Changed
+- MO4 coding standard can be installed as composer package and is released on packagist.org.
+- Replaced underlying Symfony coding standard.
+- PHPCS 3.0 or later is required.