docs: add changelog

Author: kenjis

user_guide_src/source/changelogs/v4.2.0.rst

@@ -18,6 +18,7 @@ BREAKING
     - ``spark``
 - The method signature of ``CodeIgniter\CLI\CommandRunner::_remap()`` has been changed to fix a bug.
 - The ``CodeIgniter\Autoloader\Autoloader::initialize()`` has changed the behavior to fix a bug. It used to use Composer classmap only when ``$modules->discoverInComposer`` is true. Now it always uses the Composer classmap if Composer is available.
+- The color code output by :ref:`CLI::color() <cli-library-color>` has been changed to fix a bug.
 
 Enhancements
 ************

user_guide_src/source/cli/cli_library.rst

@@ -128,6 +128,8 @@ print "Done" on the same line:
 
 .. literalinclude:: cli_library/012.php
 
+.. _cli-library-color:
+
 color()
 =======