Update changelog

Author: hxtree

CHANGELOG.md

@@ -11,6 +11,11 @@ All releases must adhere to [SemVer 2](https://semver.org/) naming convention an
 ## PHPMarkup [Unreleased]
 Released: TBA. Notable changes:
 
+## PHPMarkup 4.2.3
+Released: 2021-10-06. Notable changes:
+* Added: CI via Github Action.
+* Added: Live argument access.
+
 ## PHPMarkup 4.2.2
 Released: 2021-07-12. Notable changes:
 * Fixed: Add Properties bug.

README.md

@@ -18,7 +18,7 @@ $ composer require ouxsoft/phpmarkup
 ```
 
 ## Basic Usage
-Create an Element class with DOMElement processing instructions.
+Create an Element class containing DOMElement processing instructions.
 ```php
 <?php