add new contributing link

corneliusyaovi · web-flow · commit 7e0a12bb5959 · 2022-06-14T14:17:22.000+01:00
diff --git a/README.md b/README.md
@@ -123,7 +123,7 @@ You can also follow us [@FlutterwaveEng](https://twitter.com/FlutterwaveEng) and
 
 # Contribution guidelines
 
-Read more about our community contribution guidelines [here](/CONTRIBUTING).
+Read more about our community contribution guidelines [here](/CONTRIBUTING.md).
 
 # License
 
