Update README.rst

README.rst

@@ -289,6 +289,13 @@ Then you can run the speed test::
 or the bloat test::
 
     $ make bloat-test
+    
+Migrating code
+--------------
+
+`clang-tidy-fmt <https://github.com/mikecrowe/clang-tidy-fmt>`_ provides clang
+tidy checks for converting occurrences of `printf` and `fprintf` to
+`fmt::print`.
 
 Projects using this library
 ---------------------------