Huber on Linux does not work behind a proxy

[sarg3nt]

When running Huber from behind a proxy it is unable to talk to Github so huber search and any other command that need to talk to Github do not work.

I think you just need to configure reqwest to use the HTTP_PROXY, HTTPS_PROXY and NO_PROXY vars if they exist.
See: https://docs.rs/reqwest/latest/reqwest/struct.Proxy.html

NOTE: reqwest docs say:

NOTE: System proxies are enabled by default.

So something must be interfering with this or turning it off.
Please let me know if need someone to test changes.