Docs: Update changelog

README.org

@@ -550,6 +550,7 @@ Simple links may also be written manually in either sexp or non-sexp form, like:
 
 *Internal*
 +  Certain query predicates, when called multiple times in an ~and~ sub-expression, are optimized to a single call.
++  Use ~buffer-chars-modified-tick~ instead of ~buffer-modified-tick~.  (Thanks to [[https://github.com/yantar92][Ihor Radchenko]].)
 
 ** 0.6.2
 

org-ql.info

@@ -1034,6 +1034,8 @@ File: README.info,  Node: 07-pre,  Next: 062,  Up: Changelog
    *Internal*
    • Certain query predicates, when called multiple times in an ‘and’
      sub-expression, are optimized to a single call.
+   • Use ‘buffer-chars-modified-tick’ instead of ‘buffer-modified-tick’.
+     (Thanks to Ihor Radchenko (https://github.com/yantar92).)
 
 
 File: README.info,  Node: 062,  Next: 061,  Prev: 07-pre,  Up: Changelog
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