Merge branch 'master' into 'master'

add Mastering-OpenCV-4-with-Python github

See merge request codechina/mirrors-settings!441

imports.yml

+group:
+  name: PacktPublishing
+  descripition: 'PacktPublishing book'
+  projects:
+    - name: Mastering-OpenCV-4-with-Python
+      description: 'Mastering-OpenCV-4-with-Python'
+      mirrorRelease: false
+      topic: 'Mastering-OpenCV-4-with-Python'