- Add noto-sans-fonts: in order to have a reliable test suite with
pango 1.50, we need to have some fonts available.
- Add python-graphviz-pytest.patch: Allow to run pytest directly,
instead of run-tests.py. Allows us to further use %%pytest
without workarounds. Patch will be part of the next version.

- Update to version 0.19.1:
+ Fix undecoded CalledProcessError.stdout and .stderr when
.pipe() call with an encoding different from self.encoding
fails.
+ Fix missing project root conftest.py in source distribution.
+ Extend examples/graphviz-escapes.ipynb.
+ Improve test coverage.
+ Increase build scripts verbosity.

- Update to version 0.19:
+ Add PendingDeprecationWarning to calls using positional
arguments that will be deprecated in a later version.
+ Add keyword-only outfile argument to .render() and stand-alone
graphviz.render().
+ Add graphviz.set_jupyter_format() to set the output format used
by the Jupyter visualization of graphviz.Graph,
graphviz.Digraph, and graphviz.Source.
+ Add keyword-only raise_if_result_exists argument to .render()
and stand-alone graphviz.render().
- For all intermediate releases between 0.14.1 and 0.19, please see
the packaged CHANGES.txt.