Update release notes

release-notes/8-x.md

@@ -1,5 +1,13 @@
 # Release Notes for PROSE SDK versions 8.x
+## [Release 8.16.0](https://www.nuget.org/packages/Microsoft.ProgramSynthesis/8.16.0) - 2022/11/21
+- Microsoft.ProgramSynthesis
+  - Transformation.Formula
+    - Added Python function name handling in anonymizer.
+    - Added arithmetic operations for Excel including Add, Subtract, Multiply, Divide, Sum, Product & Average.
 
+- Microsoft.ProgramSynthesis.Lab
+  - NLToCode
+    - Added fallback Codex calls for program generation and output prediction.
 
 ## [Release 8.15.0](https://www.nuget.org/packages/Microsoft.ProgramSynthesis/8.15.0) - 2022/10/31