New wheels for opencv-python

https://pypi.org/project/opencv-python/

Author: cclauss

.travis.yml

@@ -24,6 +24,8 @@ jobs:
   include:
     - install: true
       script: pip install keras
+    - install: true
+      script: pip install opencv-python
     - install: true
       script: pip install qiskit
     - install: true