Add changelog

Author: AydinHassan

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+
+## [Unreleased][unreleased]
+### Added
+
+### Changed
+
+### Fixed
+
+### Removed
+
+## [0.3.2]
+### Fixed
+ - Fix counting of new lines in exercise 3 (#64)
+ 
+### Changed
+ - Upgraded hoa/socket to 1.0 (#65)