npm WARN deprecated browserslist@2.11.3: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.                                     npm WARN deprecated bfj-node4@5.3.1: Switch to the `bfj` package for fixes and new features!                                                                    npm WARN deprecated flatten@1.0.2: I wrote this module a very long time ago; you should use something else.