Added CHANGELOG

Author: bryanadamloh97

CHANGELOG.md

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+# Changelog
+
+**1.0.0 (released 2021-06-15):**
+- Release for production.
+- Added a ```URLShortener``` facade.
+- Updated documentation
+- Updated tests and Github Actions configuration for PHP 7.3, PHP 7.4 and PHP 8.0 testing.

README.md

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 # Laravel URL Shortener
 Powerful URL shortening tool using different drivers for your Laravel projects
 
-<p align="center">
+<p>
 <a href="https://packagist.org/packages/codeofdigital/laravel-url-shortener"><img src="https://img.shields.io/packagist/v/codeofdigital/laravel-url-shortener" alt="Latest Version on Packagist"></a>
 <a href="https://github.com/codeofdigital/laravel-url-shortener"><img src="https://img.shields.io/github/workflow/status/codeofdigital/laravel-url-shortener/run-tests" alt="Build Status"></a>
 <a href="https://packagist.org/packages/codeofdigital/laravel-url-shortener"><img src="https://img.shields.io/packagist/php-v/codeofdigital/laravel-url-shortener" alt="PHP from Packagist"></a>