Use Github sponsor link.

Author: asmorkalov

README.md

@@ -2,7 +2,7 @@
 
 ### Keep OpenCV Free
 
-OpenCV is raising funds to keep the library free for everyone, and we need the support of the entire community to do it. [Donate to OpenCV on IndieGoGo](http://igg.me/at/opencv5) to show your support.
+OpenCV is raising funds to keep the library free for everyone, and we need the support of the entire community to do it. [Donate to OpenCV on Github](https://github.com/sponsors/opencv) to show your support.
 
 - [OpenCV on Wheels](#opencv-on-wheels)
   - [Installation and Usage](#installation-and-usage)