:hackney_options config should be renamed to :httpoison_options

[aaronrenner]

Issue

I was looking through the codebase and noticed that we're actually passing :hackney_options to HTTPoison.

wallaby/lib/wallaby/httpclient.ex

Lines 53 to 55 in 4e3818d

	defp make_request(method, url, body, retry_count, retry_reasons) do
	method
	|> HTTPoison.request(url, body, headers(), request_opts())

HTTPoison takes slightly different options than hackney, so I'm thinking it would be good to update the config and docs accordingly. We'd probably want to keep :hackney_options working as is, but maybe log a deprecation warning.