Updated GitHub emoji icons

Author: Maxim-Mazurok

README.md

@@ -76,9 +76,9 @@ Votes are made by using reactions on the top level comment of the Pull Request.
 
 | Reaction | Vote    |
 |----------|---------|
-| ![+1](https://assets-cdn.github.com/images/icons/emoji/unicode/1f44d.png "+1")       | Yes     |
-| ![-1](https://assets-cdn.github.com/images/icons/emoji/unicode/1f44e.png "+1")       | No      |
-| ![confused](https://assets-cdn.github.com/images/icons/emoji/unicode/1f615.png "confused") | Abstain |
+| ![+1](https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png "+1")       | Yes     |
+| ![-1](https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png "-1")       | No      |
+| ![confused](https://github.githubassets.com/images/icons/emoji/unicode/1f615.png "confused") | Abstain |
 
 
 ## Label Overrides