Revert "Enable eslint caching in development" (facebook#1665)

Author: gaearon

packages/react-scripts/config/webpack.config.dev.js

@@ -204,14 +204,13 @@ module.exports = function(publicPath) {
       // Remember to add the new extension(s) to the "url" loader exclusion list.
     ]
   },
+  // @remove-on-eject-begin
   // Point ESLint to our predefined config.
   eslint: {
-    // @remove-on-eject-begin
     configFile: path.join(__dirname, '../.eslintrc'),
     useEslintrc: false,
-    // @remove-on-eject-end
-    cache: true
   },
+  // @remove-on-eject-end
   // We use PostCSS for autoprefixing only.
   postcss: function() {
     return [