Add Andrea Giammarchi to acknowledgements

Author: davepeck

peps/pep-0750.rst

@@ -1398,6 +1398,7 @@ Acknowledgements
 Thanks to Ryan Morshead for contributions during development of the ideas leading
 to template strings. Special mention also to Dropbox's
 `pyxl <https://github.com/dropbox/pyxl>`_ for tackling similar ideas years ago.
+Andrea Giammarchi provided thoughtful feedback on the early drafts of this PEP.
 Finally, thanks to Joachim Viide for his pioneering work on the `tagged library
 <https://github.com/jviide/tagged>`_. Tagged was not just the precursor to
 template strings, but the place where the whole effort started via a GitHub issue