Add html-to-markdown to HTML Manipulation (#3239)

Author: Goldziher

README.md

@@ -900,6 +900,7 @@ _Libraries for parsing and manipulating plain texts._
 _Libraries for working with HTML and XML._
 
 - [beautifulsoup](https://www.crummy.com/software/BeautifulSoup/bs4/doc/) - Providing Pythonic idioms for iterating, searching, and modifying HTML or XML.
+- [html-to-markdown](https://github.com/xberg-io/html-to-markdown) - A fast, CommonMark-compliant HTML to Markdown converter with a Rust core, tolerant of malformed HTML.
 - [justhtml](https://github.com/EmilStenstrom/justhtml/) - A pure Python HTML5 parser that just works.
 - [lxml](https://github.com/lxml/lxml) - A very fast, easy-to-use and versatile library for handling HTML and XML.
 - [markupsafe](https://github.com/pallets/markupsafe) - Implements a XML/HTML/XHTML Markup safe string for Python.