Add changelog

Author: hudochenkov

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## 1.2.1
+* Fixed comments wrong ordering and added better tests for it.
+
+## 1.2.0
+* Added `empty-lines-between-children-rules` option which set a number of empty lines between nested children rules. (thanks, @scalder27) #9
+
+## 1.1.0
+* [Sort prefixed properties](https://github.com/hudochenkov/postcss-sorting#prefixed-properties) without explicit specifying in config.
+* Support for SCSS files if [postcss-scss](https://github.com/postcss/postcss-scss) used for parsing.
+
+## 1.0.1
+* Change .npmignore to not deliver unneeded files.
+
+## 1.0.0
+* Initial release.