fix: remove deprecated rule (facebook#9401)

Author: ljosberinn

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

@@ -36,7 +36,6 @@ That's it! You can override the settings from `eslint-config-react-app` by editi
 
 The following rules from the [eslint-plugin-jsx-a11y](https://github.com/evcohen/eslint-plugin-jsx-a11y) plugin are activated:
 
-- [accessible-emoji](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/accessible-emoji.md)
 - [alt-text](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/alt-text.md)
 - [anchor-has-content](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/anchor-has-content.md)
 - [aria-activedescendant-has-tabindex](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/aria-activedescendant-has-tabindex.md)

packages/eslint-config-react-app/index.js

@@ -284,7 +284,6 @@ module.exports = {
     'react/style-prop-object': 'warn',
 
     // https://github.com/evcohen/eslint-plugin-jsx-a11y/tree/master/docs/rules
-    'jsx-a11y/accessible-emoji': 'warn',
     'jsx-a11y/alt-text': 'warn',
     'jsx-a11y/anchor-has-content': 'warn',
     'jsx-a11y/anchor-is-valid': [