Fixed to a correct link

README.md

@@ -39,7 +39,7 @@ SDK.init();
 ```
 
 ## API
-A full API reference of can be found [here](https://docs.microsoft.com/en-us/azure/devops/extend/reference/client/core-sdk).
+A full API reference of can be found [here](https://docs.microsoft.com/en-us/javascript/api/azure-devops-extension-sdk/).
 
 
 ## Code of Conduct