Add changelog

Author: thagberg

CHANGELOG.md

@@ -233,6 +233,7 @@
     Bug #8441: Freeze when using video main menu replacers
     Bug #8445: Launcher crashes on exit when cell name loading thread is still running
     Bug #8462: Crashes when resizing the window on macOS
+    Bug #8465: Blue screen w/ antialiasing and post-processing on macOS
     Feature #1415: Infinite fall failsafe
     Feature #2566: Handle NAM9 records for manual cell references
     Feature #3501: OpenMW-CS: Instance Editing - Shortcuts for axial locking