Bump version to 3.3-stable \o/

Congratulations to everyone in the Godot community for this awesome new
release!

What started as a 3.2.4 maintenance update for the Godot 3.2 branch finally
evolved to be a very significant release which warranted a version change,
so here we are with Godot 3.3!

It includes close to 2000 commits from over 250 contributors since the 3.2.3
release in September 2020.

Thanks to all involved, whether you contributed code, documentation, bug
reports, translations, community support or donations. You all played a role
in bringing better free and open source game development tools to the world!

CHANGELOG.md

@@ -4,9 +4,9 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## [3.3] - TBD
+## [3.3] - 2021-04-21
 
-See the [release announcement](TBD) for details.
+See the [release announcement](https://godotengine.org/article/godot-3-3-has-arrived) for details.
 
 ### Added
 

version.py

@@ -3,7 +3,7 @@ name = "Godot Engine"
 major = 3
 minor = 3
 patch = 0
-status = "rc"
+status = "stable"
 module_config = ""
 year = 2021
 website = "https://godotengine.org"