Update CHANGELOG.md

Update changelog before release it. I was unable to push a new changelog.

CHANGELOG isnt allowed to be edited in a fork, only in the original fork.

CHANGELOG.md

@@ -1,5 +1,24 @@
 # CHANGELOG
 
+## 0.0.20-alpha-2
+
+- Changed the version from `0.0.2-alpha` to `0.0.20-alpha-2` as suggested by @odudex;
+- Refactored the code a little bit to be more pythonic;
+- Removed startup messages as suggested by @tadeubas:
+  - On linux the `GreetingsScreen` class will check:
+    - if user is on `dialout`/`uucp` group (debian and fedora based / archlinux);
+    - internet connection
+  - On MacOS an Windows the `GreetingsScreen` class will check:
+    - internet connection
+- Added the window resize behaviour;
+- Removed fullscreen on startup;
+- Fedora and Ubuntu:
+  - fixed desktop icon entry on `.ci/create-deb`;
+  - fixed desktop icon entry on `.ci/create-rpm`;
+- Added more tests:
+  - ask_permissions_dialout_screen;
+  - error_screen.
+
 ## 0.0.2-alpha
 
 - code refactoration from `nodejs` to `python`;