update changelog

Author: hossam26644

python/CHANGELOG.rst

@@ -12,12 +12,15 @@
   associated with each individual as a numpy array.
   (:user:`benjeffery`, :pr:`3153`)
 
+- Implement thin space separation for thousands in the numbers output for html
+  and text.
+  (:user:`hossam26644`, :pr:`3167`, :issue:`2951`)
 
 **Fixes**
 
 - Correct assertion message when tables are compared with metadata ignored.
   (:user:`benjeffery`, :pr:`3162`, :issue:`3161`)
-  
+
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 [0.6.3] - 2025-04-28
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