Update ESlint Install Docs (#7451)

Author: mrmckeb

packages/eslint-config-react-app/README.md

@@ -19,7 +19,7 @@ If you want to use this ESLint configuration in a project not built with Create
 First, install this package, ESLint and the necessary plugins.
 
 ```sh
-npm install --save-dev eslint-config-react-app @typescript-eslint/eslint-plugin@1.x @typescript-eslint/parser@1.x babel-eslint@10.x eslint@5.x eslint-plugin-flowtype@2.x eslint-plugin-import@2.x eslint-plugin-jsx-a11y@6.x eslint-plugin-react@7.x eslint-plugin-react-hooks@1.x
+npm install --save-dev eslint-config-react-app @typescript-eslint/eslint-plugin@1.x @typescript-eslint/parser@1.x babel-eslint@10.x eslint@6.x eslint-plugin-flowtype@3.x eslint-plugin-import@2.x eslint-plugin-jsx-a11y@6.x eslint-plugin-react@7.x eslint-plugin-react-hooks@1.x
 ```
 
 Then create a file named `.eslintrc.json` with following contents in the root folder of your project: