Fix contributors link

Author: akiran

README.md

@@ -230,7 +230,7 @@ open http://localhost:8080
 ## Contributors
 
 This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
-<a href="graphs/contributors"><img src="https://opencollective.com/react-slick/contributors.svg?width=890" /></a>
+<a href="https://github.com/akiran/react-slick/graphs/contributors"><img src="https://opencollective.com/react-slick/contributors.svg?width=890" /></a>
 
 
 ## Backers