Fix broken link to opencv website (home-assistant#2581)

filcole · fabaff · commit 7cf5b8002dcf · 2017-05-07T00:00:10.000+02:00
diff --git a/source/_components/opencv.markdown b/source/_components/opencv.markdown
@@ -13,7 +13,7 @@ ha_release: 0.44
 ha_iot_class: "Local Push"
 ---
 
-[OpenCV](https://www.opencv.org) is an open source computer vision image and video processing library.
+[OpenCV](http://www.opencv.org) is an open source computer vision image and video processing library.
 
 Some pre-defined classifiers can be found here: https://github.com/opencv/opencv/tree/master/data
 
