fast-folder-size install behind proxy error

[BStoller]

I wanted to follow up regarding #34 as I am trying to install tree-node-cli behind a proxy.

fast-folder-size uses an HTTP call to retrieve a utility for Windows hosts and didn't support proxies when installing it until 2.2.0.

Would it be possible to look into refactoring tree-node-cli to not use fast-folder-size?

[marcofugaro]

I believe you can use v1.4.0 for your particular usecase.