Bump matplotlib from 3.0.3 to 3.3.4

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.0.3 to 3.3.4.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.0.3...v3.3.4)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

requirements.txt

@@ -8,7 +8,7 @@ opencv-python==3.4.5.20
 opencv-contrib-python==4.4.0.46
 numpy>=1.14.5
 pandas==1.1.4
-matplotlib==3.0.3
+matplotlib==3.3.4
 scikit-image==0.17.2
 scipy==1.5.4
 pyzmq==20.0.0