[eslint config] [fix] jsx should be enabled via parserOptions, not via a root ecmaFeatures.

From https://github.com/airbnb/javascript/issues/1410#issuecomment-303368921

packages/eslint-config-airbnb/rules/react-a11y.js

@@ -3,9 +3,13 @@ module.exports = {
     'jsx-a11y',
     'react'
   ],
-  ecmaFeatures: {
-    jsx: true
+
+  parserOptions: {
+    ecmaFeatures: {
+      jsx: true,
+    },
   },
+
   rules: {
     // Enforce that anchors have content
     // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/anchor-has-content.md

packages/eslint-config-airbnb/rules/react.js

@@ -2,14 +2,12 @@ module.exports = {
   plugins: [
     'react',
   ],
+
   parserOptions: {
     ecmaFeatures: {
       jsx: true,
     },
   },
-  ecmaFeatures: {
-    jsx: true,
-  },
 
   // View link below for react rules documentation
   // https://github.com/yannickcr/eslint-plugin-react#list-of-supported-rules