Update changelog for 0.4 release

Author: dimitry-ishenko

debian/changelog

@@ -1,8 +1,18 @@
-pgm-args (0.4) UNRELEASED; urgency=medium
+pgm-args (0.4) unstable; urgency=medium
 
-  * 
+  * Update README
+  * Install examples inside dir
+  * Add missing CMake dep
+  * Update control file
+  * Simplify rules & copyright
+  * Update CMake file
+  * Call member functions directly
+  * Doxygen-friendly comments
+  * Update copyright years
+  * Remove type aliases
+  * Prep for v0.4
 
- -- Dimitry Ishenko <dimitry.ishenko@gmail.com>  Sat, 28 Sep 2024 11:06:21 -0400
+ -- Dimitry Ishenko <dimitry.ishenko@gmail.com>  Sat, 28 Sep 2024 12:56:27 -0400
 
 libpgm-args-dev (0.3) unstable; urgency=medium