Changelog updated

CHANGELOG.md

@@ -4,6 +4,21 @@ All notable changes to Net2Plan will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/).
 
+
+## [0.5.3] - 2018-02-14
+### Added
+    - Added Optical Fiber Utils.
+	- Report for Optical Fiber networks following calculations of Gaussian  Noise Model.
+
+### Fixed
+    - Site mode does not break the tool when loading a new topology.
+	- Corrected layer table tags.
+	- Sorting table columns works as it should.
+	- Other bug fixes.
+
+####
+
+
 ## [0.5.2] - 2017-05-24
 ### Added
     - Added a new tab under the "Demands" table for traffic matrix visualization and control.