Add changelog & update readme

Changelog.md

@@ -0,0 +1,14 @@
+# Change Log
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [1.0.3] - 2021-03-22
+
+### Added
+- Ability to simple check MX records of a domain
+
+### Changed
+
+### Fixed

Readme.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://travis-ci.com/fedek6/tld-mail-validator.svg?token=Fpapy2MXqrwtfsLgfThp&branch=main)](https://travis-ci.com/fedek6/tld-mail-validator)
 
-PHP e-mail address validator using list of all known [TLDs](https://data.iana.org/TLD/tlds-alpha-by-domain.txt). With ability to automatically update tlds list.
+PHP e-mail address validator using list of all known [TLDs](https://data.iana.org/TLD/tlds-alpha-by-domain.txt) and simple domain MX record check. With ability to automatically update top-level domains list.
 
 ## Usage example
 
@@ -25,6 +25,13 @@ if ($validator->validate('[email protected]')) {
 }
 ```
 
+If you want to test also MX record of a domain (slower), pass second argument to the constructor:
+
+```php
+/** @var \Fedek6\TldMailValidator\TldMailValidator $validator */
+$validator = new TldMailValidator($tldsFilePath, TldMailValidator::TEST_ALL);
+```
+
 ## Testing
 
 ```bash
@@ -42,3 +49,10 @@ Or:
 ```bash
 vendor/bin/phpunit --testdox --verbose --colors tests/RemoteFileUpdaterTest.php
 ```
+
+### Dry run before deploy
+
+```bash
+php -f examples/mx.php
+php -f examples/simple.php
+```