Update CHANGELOG.md

Author: IlCallo

CHANGELOG.md

@@ -1,47 +1,60 @@
 # Changelog
 
-All notable changes to `laravel-cloudfront-url-signer` will be documented in this file.
+All notable changes to this project will be documented in this file.
 
-## Unreleased
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## 2.1.0 - 2019-06-03
+
+## [Unreleased]
+### Changed
+- Updated CHANGELOG to adhere to "Keep a Changelog" initiative
+
+## [2.1.0] - 2019-06-03
+### Added
 - Added support for L5.8
 
-## 2.0.0 - 2018-09-24
-- [**BREAKING**] Removed support for L5.5
+## [2.0.0] - 2018-09-24
+### Added
 - Added support for L5.7
 
-## 1.0.1 - 2018-04-22
+### Removed
+- Removed support for L5.5
+
+## [1.0.1] - 2018-04-22
+### Added
 - Updated CHANGELOG to cover undocumented releases
+
+### Changed
 - Removed dependency and consequentially php-intl extension: it gives some problems on High Sierra development environment. URL check is now delegated to AWS SDK. 
 
-## 1.0.0 - 2018-02-19
-- Added Laravel 5.6 compliance
+## [1.0.0] - 2018-02-19
+### Added
+- Add support for L5.6
 
-## 0.1.5 - 2018-02-18
+## [0.1.5] - 2018-02-18
+### Fixed
 - getExpirationTimestamp now returns int value instead of string to overcome an AWS SDK bug
 
-## 0.1.4 - 2018-02-13
+## [0.1.4] - 2018-02-13
+### Changed
 - Refactored tests
 - Switched to UrlSigner class instead of CloudFrontClient
 
-## 0.1.3 - 2018-02-09
-- Fixed README typo
+## [0.1.3] - 2018-02-09
+### Changed
 - $expiration default behaviour moved to internal `sign()` method instead of helper
 
-## 0.1.2 - 2018-02-09
-
+## [0.1.2] - 2018-02-09
+### Fixed
 - Fixed config publishing
-- $expiration default behaviour moved to internal `sign()` method instead of helper
-
-## 0.1.1 - 2018-02-09
 
+### Changed
 - $expiration parameter of `sign()` helper now defaults to the value defined in the configuration file when not defined
 
-## 0.1.1 - 2018-02-09
-
+## [0.1.1] - 2018-02-09
+### Added
 - Added `sign()` helper
 
-## 0.1.0 - 2018-02-09
-
+## [0.1.0 - 2018-02-09
 - Initial release