Fixed typescript error#3

adrianhm13 wants to merge 1 commit intoThomasFindlay:chapter/advanced-component-patterns/finalThomasFindlay/react-the-road-to-enterprise:chapter/advanced-component-patterns/finalfrom

adrianhm13:chapter/advanced-component-patterns/finaladrianhm13/react-the-road-to-enterprise:chapter/advanced-component-patterns/finalCopy head branch name to clipboard