is there a way to provide self-signed CA certificates?

[killerswan]

I'm seeing this from Tentacat.Commits.find with a GHE using a self-signed CA:

19:02:06.119 [error] SSL: :certify: ssl_handshake.erl:1490:Fatal error: unknown ca

** (HTTPoison.Error) {:tls_alert, 'unknown ca'}
    (tentacat) lib/tentacat.ex:2: Tentacat.request!/5
    (tentacat) lib/tentacat.ex:42: Tentacat.json_request/5

I believe HTTPoison's request!/5 (which is used in Tentacat, e.g., here) takes some kind of list of options where I could specify a "cacertfile" path...

If not for #65 I'd try that, but is there an easier way to just override some HTTPoison default setting and provide a CA cert in my own project's config.exs?

[duksis]

I assume that this can be closed as #69 is merged. Thanks @killerswan !