Revert comment about min supported node version

Author: Enoah Netzach

packages/create-react-app/index.js

@@ -30,7 +30,7 @@
 // tell people to update their global version of create-react-app.
 //
 // Also be careful with new language features.
-// This file must work on Node 4+.
+// This file must work on Node 0.10+.
 //
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //   /!\ DO NOT MODIFY THIS FILE /!\