Add proxy option to config and prepare the requests with it

[ckeen]

I need these changes to be able to use toot behind a mandatory proxy. I am not that fluent in python so I am proposing this as a proof of concept. If you want me to change it so it will fit the upstream sources better, please do tell.

Thanks!

[ihabunek]

Hi! Sorry for ignoring you for a long while.

Turns out that requests has an option to set the proxies via enironment variables. I made the required changes to support these in 7195a05.

Documented here:
https://toot.readthedocs.io/en/latest/advanced.html#using-proxies

Does this work for you?

[ckeen]

* Ivan Habunek <notifications@github.com> [181230 11:15]:

Hi! Sorry for ignoring you for a long while. Turns out that requests has an option to [set the proxies via enironment variables](http://docs.python-requests.org/en/master/user/advanced/#proxies). I made the required changes to support these in 7195a05. Documented here: https://toot.readthedocs.io/en/latest/advanced.html#using-proxies Does this work for you?

Yes, awesome! Thank you!

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