Add bartleby to built-with-nio (#491)

* Added bartleby to build-with-nio documentation page.

* Fixed link formatting

doc/built-with-nio.rst

@@ -26,5 +26,6 @@ Projects built with nio
 - `opsdroid <https://github.com/opsdroid/opsdroid>`_
 - `niobot <https://pypi.org/project/nio-bot>`_ - An extensive framework for building powerful Matrix bots with ease
 - `matrix-reminder-bot <https://github.com/anoadragon453/matrix-reminder-bot>`_ - A bot to remind you about stuff
+- `bartleby <https://github.com/gperdrizet/bartleby>`_ - A LLM chatbot and writing assistant using HuggingFace
 
 Are we missing a project? Submit a pull request and we'll get you added! Just edit ``doc/built-with-nio.rst``