Update cherrpy to 17.4.2

lib/cherrypy/tutorial/README.rst

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+CherryPy Tutorials
+------------------
+
+This is a series of tutorials explaining how to develop dynamic web
+applications using CherryPy. A couple of notes:
+
+
+- Each of these tutorials builds on the ones before it. If you're
+  new to CherryPy, we recommend you start with 01_helloworld.py and
+  work your way upwards. :)
+
+- In most of these tutorials, you will notice that all output is done
+  by returning normal Python strings, often using simple Python
+  variable substitution. In most real-world applications, you will
+  probably want to use a separate template package (like Cheetah,
+  CherryTemplate or XML/XSL).