Update README.md

ruwanego · ruwanego · commit 6c81bd68613a · 2020-06-01T10:30:30.000+05:30
diff --git a/README.md b/README.md
@@ -119,7 +119,7 @@ if __name__ == "__main__":
 
 ## Object Model
 
-- Use Rust Rc and RefCell to do reference counting of Python objects
+- Use Rust [Rc](https://doc.rust-lang.org/std/rc/struct.Rc.html) and [RefCell](https://doc.rust-lang.org/std/cell/struct.RefCell.html) to do reference counting of Python objects
 - Optionally store rust payload (for instance String, or f64)
 
 ```rust
