Fix doc

Signed-off-by: alexey semenyuk <[email protected]>

Author: alex-semenyuk

CONTRIBUTING.md

@@ -4,5 +4,5 @@ We welcome contributions to the FireFly Project in many forms, and
 there's always plenty to do!
 
 Please visit the
-[contributors guide](https://hyperledger.github.io/firefly/contributors/index.html) in the
+[contributors guide](https://hyperledger.github.io/firefly/latest/contributors/index) in the
 docs to learn how to make contributions to this exciting project.