Update the CHANGELOG.md file

It modifies the hexacode of the constants color and adds the fact that
256-color terminals are supported.

CHANGELOG.md

@@ -2,10 +2,26 @@
 All notable changes to this project will be documented in this file. This
 project adheres to [Semantic Versioning].
 
-# [Unreleased]
+# [0.2.0] - 2019-03-09
 
 ### Added
 
+- Add support for 256-colors terminal.
+
+  + If 256-colors are required, the following must be used in `.vimrc`:
+
+    ```vim
+    set termguicolors
+    colorscheme odyssey
+    ```
+
+  + If 24-bits colors are required, the following must be used `.vimrc`:
+
+    ```vim
+    set t_Co=256
+    colorscheme odyssey
+    ```
+
 - Add the highlight for the default syntax group names Cursor and lCursor.
   Those are basically the opposite of Normal.
 
@@ -68,5 +84,6 @@ project adheres to [Semantic Versioning].
 
   + Otherwise, a GUI version of Vim must be used.
 
-[Unreleased]: https://github.com/ludokng/vim-odyssey/compare/0.1.0...HEAD
+[Unreleased]: https://github.com/ludokng/vim-odyssey/compare/0.2.0...HEAD
+[0.2.0]: https://github.com/ludokng/vim-odyssey/compare/0.1.0...0.2.0
 [Semantic Versioning]: https://semver.org/spec/v2.0.0.html