Update react-devtools URL (#2408)

content/docs/lifting-state-up.md

@@ -324,7 +324,7 @@ Lifting state involves writing more "boilerplate" code than two-way binding appr
 
 If something can be derived from either props or state, it probably shouldn't be in the state. For example, instead of storing both `celsiusValue` and `fahrenheitValue`, we store just the last edited `temperature` and its `scale`. The value of the other input can always be calculated from them in the `render()` method. This lets us clear or apply rounding to the other field without losing any precision in the user input.
 
-When you see something wrong in the UI, you can use [React Developer Tools](https://github.com/facebook/react-devtools) to inspect the props and move up the tree until you find the component responsible for updating the state. This lets you trace the bugs to their source:
+When you see something wrong in the UI, you can use [React Developer Tools](https://github.com/facebook/react/tree/master/packages/react-devtools) to inspect the props and move up the tree until you find the component responsible for updating the state. This lets you trace the bugs to their source:
 
 <img src="../images/docs/react-devtools-state.gif" alt="Monitoring State in React DevTools" max-width="100%" height="100%">