Bump opencv-python from 3.2.0.7 to 4.2.0.32

Bumps [opencv-python](https://github.com/skvark/opencv-python) from 3.2.0.7 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

@@ -6,7 +6,7 @@ matplotlib==2.0.0
 networkx==1.11
 numpy==1.12.0
 olefile==0.44
-opencv-python==3.2.0.7
+opencv-python==4.2.0.32
 packaging==16.8
 pandas==0.20.1
 Pillow==4.0.0