changelog update

Author: ZeeCoder

CHANGELOG.md

@@ -5,15 +5,15 @@ All notable changes to this project will be documented in this file.
 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).
 
-## [Unreleased]
+## [3.0.0-alpha.3]
 
 ### Added
 
 - Integration tests, supported by SauceLabs
 - `postcss-container-query`
-  - Ability to re-export previously exported meta found in the css. Added to be
-    compatible with Parcel bundler which reruns the same plugins over the same
-    css file multiple times.
+  - [Parcel bundler](https://github.com/parcel-bundler/parcel) support.
+    Re-running the plugin on the same file is now safe. (The Parcel bundler reruns
+    the same plugins over the same css file multiple times.)
 
 ### Changed