add proxy settings

[dmpe]

Hi, it would have been really nice if you could add to Fred() call also proxy settings. Thanks

[amandus1990]

agree. it is easy to realize but useful

[TomasKoutek]

Hi, as an alternative you can use package pystlouisfed, where it is possible to set parameters from requests.request

from pystlouisfed import FRED

fred = FRED(
    api_key='abcdefghijklmnopqrstuvwxyz123456',
    request_params={
        'proxies': {
            "http": 'http://127.0.0.1:3128',
            "https": 'http://127.0.0.1:3128'
        }
    })

df = fred.series_observations(series_id='GDP')

[milmr]

Opened a PR#65 for this issue.

[Tvogel20]

Could this be pulled, the code looks good? Thanks