Release version 13.20.0 (#1785)

Features:
 * Kotlin: interfaces are now generated as functional interfaces
           whenever it is possible.
 * Kotlin: static properties of classes can be now accessed also
           via static getter and setter generated as extension function.
 * Kotlin: generated collection types are immutable.

Signed-off-by: Patryk Wrobel <[email protected]>

Author: pwrobeldev

CHANGELOG.md

@@ -1,9 +1,11 @@
 # Gluecodium project Release Notes
 
-## Unreleased
+## 13.20.0
+Release date 2025-11-05
 ### Features:
  * Kotlin: interfaces are now generated as functional interfaces whenever it is possible.
  * Kotlin: static properties of classes can be now accessed also via static getter and setter generated as extension function.
+ * Kotlin: generated collection types are immutable.
 
 ## 13.19.0
 Release date 2025-08-11

gluecodium/src/main/resources/version.properties

@@ -1 +1 @@
-version = 13.19.0
+version = 13.20.0