Update dependency opencv-python to v3.4.13.47 (#40)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

setup.py

@@ -43,7 +43,7 @@ def folder_init(description='description', default_path=''):
     # 'tensorflow==1.4.1',
     # 'tensorflow-gpu==1.4.1',
     'requests==2.18.4',
-    'opencv-python==3.4.0.12',
+    'opencv-python==3.4.13.47',
     'scikit-learn==0.19.1',
     'scikit-image==0.13.1',
     'pillow==5.0.0',