docs: fix broken link (reduxjs#1548)

Author: numb86

docs/introduction/basic-tutorial.md

@@ -277,7 +277,7 @@ const TodoList = // ... UI component implementation
 export default connect(state => ({ todos: getTodos(state) }))(TodoList);
 ```
 
-We recommend encapsulating any complex lookups or computations of data in selector functions. In addition, you can further optimize the performance by using [Reselect](https://github.com/reduxjs/reselect) to write “memoized” selectors that can skip unnecessary work. (See [the Redux docs page on Computing Derived Data](https://redux.js.org/recipes/computingderiveddata#sharing-selectors-across-multiple-components) and the blog post [Idiomatic Redux: Using Reselect Selectors for Encapsulation and Performance](https://blog.isquaredsoftware.com/2017/12/idiomatic-redux-using-reselect-selectors/) for more information on why and how to use selector functions.)
+We recommend encapsulating any complex lookups or computations of data in selector functions. In addition, you can further optimize the performance by using [Reselect](https://github.com/reduxjs/reselect) to write “memoized” selectors that can skip unnecessary work. (See [the Redux docs page on Computing Derived Data](https://redux.js.org/recipes/computing-derived-data#sharing-selectors-across-multiple-components) and the blog post [Idiomatic Redux: Using Reselect Selectors for Encapsulation and Performance](https://blog.isquaredsoftware.com/2017/12/idiomatic-redux-using-reselect-selectors/) for more information on why and how to use selector functions.)
 
 Now that our `<TodoList />` is connected to the store. It should receive the list of todos, map over them, and pass each todo to the `<Todo />` component. `<Todo />` will in turn render them to the screen. Now try adding a todo. It should come up on our todo list!