added stub for testing #84

Author: previ

requirements_stub.txt

@@ -23,7 +23,7 @@ jsonschema==2.6.0
 Markdown==2.6.11
 MarkupSafe==1.0
 numpy==1.14.3
-opencv-contrib-python
+opencv-contrib-python==3.4.5
 pigpio==1.40.post1
 Pillow==5.1.0
 protobuf==3.6.1