Bump matplotlib from 3.3.3 to 3.3.4 (#175)

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.3.3 to 3.3.4.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](https://github.com/matplotlib/matplotlib/compare/v3.3.3...v3.3.4)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

setup.py

@@ -56,7 +56,7 @@ setup(
         'flower==0.9.7',
         'tqdm==4.56.2',
         'requests==2.25.1',
-        'matplotlib==3.3.3',
+        'matplotlib==3.3.4',
         'bokeh==2.2.3',
         'pandas==1.1.5',
         'flydenity==0.1.5',