chore: public preview prep

Author: damilola-paystack

README.md

@@ -179,7 +179,7 @@ npm test
 
 Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
 
-See [contributing.md](contributing.md) for more details.
+See [CONTRIBUTING.md](CONTRIBUTING.md) for more details.
 
 ## License