Bump opencv-python from 3.4.5.20 to 4.2.0.32 (antoinelame#65)

Bumps [opencv-python](https://github.com/skvark/opencv-python) from 3.4.5.20 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] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,3 +1,3 @@
 numpy == 1.16.1
-opencv_python == 3.4.5.20
+opencv_python == 4.2.0.32
 dlib == 19.16.0