Update release notes wrt #835

Author: k163377

release-notes/CREDITS-2.x

@@ -15,6 +15,11 @@ Authors:
 
 Contributors:
 
+# 2.19.0 (not yet released)
+
+WrongWrong (@k163377)
+* #835: Remove old SingletonSupport class and unified with KotlinFeature.SingletonSupport
+
 # 2.18.0 (26-Sep-2024)
 
 WrongWrong (@k163377)

release-notes/VERSION-2.x

@@ -18,7 +18,7 @@ Co-maintainers:
 
 2.19.0 (not yet released)
 
-- No changes since 2.18
+#835: Remove old SingletonSupport class and unified with KotlinFeature.SingletonSupport.
 
 2.18.0 (26-Sep-2024)