Update CHANGELOG.md

Author: IlCallo

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to `laravel-cloudfront-url-signer` will be documented in thi
 
 ## Unreleased
 
+## 2.0.0 - 2018-09-24
+**BREAKING** Removed support for L5.5
+Added support for L5.7
+
 ## 1.0.1 - 2018-04-22
 - Updated CHANGELOG to cover undocumented releases
 - Removed dependency and consequentially php-intl extension: it gives some problems on High Sierra development environment. URL check is now delegated to AWS SDK.