Bump version to 3.2.2-stable

This release includes many bugfixes, UX enhancements but also a number
of new features such as C# support on iOS, 2D batching for GLES2, a new
plugin system for Android, and DTLS support!

Thanks to all contributors! <3

Author: akien-mga

version.py

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