Fix up eject script

Author: gaearon

packages/react-scripts/scripts/eject.js

@@ -35,7 +35,6 @@ prompt(
     path.join('config', 'flow', 'css.js.flow'),
     path.join('config', 'flow', 'file.js.flow'),
     path.join('config', 'paths.js'),
-    path.join('config', 'env.js'),
     path.join('config', 'polyfills.js'),
     path.join('config', 'webpack.config.dev.js'),
     path.join('config', 'webpack.config.prod.js'),