Update change log for release of v1.9.3

Author: OldSneerJaw

CHANGELOG.md

@@ -2,7 +2,7 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [Unreleased]
+## [1.9.3] - 2017-10-23
 ### Fixed
 - [#152](https://github.com/Kashoo/synctos/issues/152): Cannot append a new object with immutable properties to an array
 
@@ -89,7 +89,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ## [1.0.0] - 2016-07-12
 First public release
 
-[Unreleased]: https://github.com/Kashoo/synctos/compare/v1.9.2...HEAD
+[Unreleased]: https://github.com/Kashoo/synctos/compare/v1.9.3...HEAD
+[1.9.3]: https://github.com/Kashoo/synctos/compare/v1.9.2...v1.9.3
 [1.9.2]: https://github.com/Kashoo/synctos/compare/v1.9.1...v1.9.2
 [1.9.1]: https://github.com/Kashoo/synctos/compare/v1.9.0...v1.9.1
 [1.9.0]: https://github.com/Kashoo/synctos/compare/v1.8.0...v1.9.0