docs/api/createSelector.md: link to hooks guide (#202)

* docs/api/createSelector.md: link to hooks guide

When I first came to use createSelector it wasn't obvious to me how to use
it with hooks.
The reselect docs don't cover it, and I went down a few rabbit holes
before discovering that the react-redux Hooks docs cover it well.

* Update createSelector.md

Author: mykter

docs/api/createSelector.md

@@ -12,6 +12,7 @@ The `createSelector` utility from the [Reselect library](https://github.com/redu
 For more details on using `createSelector`, see:
 
 - The [Reselect API documentation](https://github.com/reduxjs/reselect)
+- [React-Redux docs: Hooks API - Using memoizing selectors](https://react-redux.js.org/next/api/hooks#using-memoizing-selectors)
 - [Idiomatic Redux: Using Reselect Selectors for Encapsulation and Performance](https://blog.isquaredsoftware.com/2017/12/idiomatic-redux-using-reselect-selectors/)
 - [React/Redux Links: Reducers and Selectors](https://github.com/markerikson/react-redux-links/blob/master/redux-reducers-selectors.md)