Bump version to 3.2.1-stable

Many bugfixes have been cherry-picked since the 3.2-stable release of
late January 2020, including some regressions.

Thanks to all contributors! <3

version.py

@@ -3,7 +3,7 @@ name = "Godot Engine"
 major = 3
 minor = 2
 patch = 1
-status = "rc"
+status = "stable"
 module_config = ""
 year = 2020
 website = "https://godotengine.org"