Update README.md

README.md

@@ -81,4 +81,4 @@ the ability to distribute load/query work over several cores to benefit on paral
 ### Contribution
 
 Feel free to contribute to the project by forking the repository and submittin.g pull requests.
-Please make sure you have read our [contributing guide](CONTRIBUTING.MD)
+Please make sure you have read our [contributing guide](https://github.com/questdb/questdb/blob/master/CONTRIBUTING.MD)