Bump opencv-python from 3.4.0.12 to 4.2.0.32

Bumps [opencv-python](https://github.com/skvark/opencv-python) from 3.4.0.12 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
...

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requirements.txt

@@ -6,7 +6,7 @@ matplotlib==3.0.2
 joblib==0.12.0
 tensorflow_gpu==1.15.2
 cloudpickle==0.5.3
-opencv_python==3.4.0.12
+opencv_python==4.2.0.32
 scipy==1.1.0
 numpy==1.14.1
 gym==0.10.4