python3-graphviz: upgrade 0.19.2 -> 0.20

Changelog:
==========
- Add keyword-only neato_no_op argument to .render(), .pipe(), and stand-alone
  graphviz.render() and graphviz.pipe().
- When building a Graph or Digraph, warn about an expected DOT syntax error in
  rendering when passing a string that ends with an odd number of backslashes
  (e.g. invalid dot.node('spam', label='\\') instead of correct ..., label=r'\\'
  for a node labled as a backslash).
- Increase visibility of graphviz.escape() in the documentation.

Signed-off-by: Xu Huan <xuhuan.fnst@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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