Bump opencv-python from 3.4.4.19 to 4.2.0.32

Bumps [opencv-python](https://github.com/skvark/opencv-python) from 3.4.4.19 to 4.2.0.32.
- [Release notes](https://github.com/skvark/opencv-python/releases)
- [Commits](https://github.com/skvark/opencv-python/commits)

---
updated-dependencies:
- dependency-name: opencv-python
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -70,7 +70,7 @@ nose==1.3.7
 notebook==5.7.4
 numexpr==2.6.8
 numpy==1.16.2
-opencv-python==3.4.4.19
+opencv-python==4.2.0.32
 openpyxl==2.0.2
 packaging==19.0
 pandas==0.24.2