#4317: Fix an Array Bounds Read in imageop.rgb2rgb8.

Will backport to 2.4.
diff --git a/Misc/NEWS b/Misc/NEWS
index 1012541..d84ec84 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 Core and Builtins
 -----------------
 
+- Issue #4317: Fixed a crash in the imageop.rgb2rgb8() function.
+
 - Issue #4230: If ``__getattr__`` is a descriptor, it now functions correctly.
 
 - Issue #4048: The parser module now correctly validates relative imports.