Update CHANGELOG for v1.0.0

Author: razor-x

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](https://semver.org/).
 
-## [Unreleased]
+## [1.0.0] / 2019-01-31
 
 ### Added
 
@@ -49,6 +49,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 
 [httpbin.org]: https://httpbin.org/
 
-[Unreleased]: https://github.com/immutablewebapps/aws-lambda-edge-example/compare/v0.4.0...HEAD
+[Unreleased]: https://github.com/immutablewebapps/aws-lambda-edge-example/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/immutablewebapps/aws-lambda-edge-example/compare/v0.4.0...v1.0.0
 [0.4.0]: https://github.com/immutablewebapps/aws-lambda-edge-example/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/immutablewebapps/aws-lambda-edge-example/compare/v0.2.0...v0.3.0