build(deps): bump opencv-python from 3.2.0.6 to 4.2.0.32

Bumps [opencv-python](https://github.com/skvark/opencv-python) from 3.2.0.6 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>

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-opencv-python==3.2.0.6
+opencv-python==4.2.0.32
 matplotlib==2.1.1
 pandas==0.22.0
 numpy==1.12.1