Support for .diff and .patch mediatypes

[smetana]

GitHub API allows to set Accept header to application/vnd.github.v3.diff and application/vnd.github.v3.patch to return raw diffs and patches. This raises error in Tentacat because response body is always processed by JSX.decode!. Even if it is not json

[gvaughn]

I'm looking to get diffs from tentacat too. @smetana did you find a solution?

[smetana]

We use direct call to HTTPoison.get

 def get_diff(url, client) do
   headers = [{"Accept", "application/vnd.github.v3.diff"}]
   headers = Tentacat.authorization_header(client.auth, headers)
   response = HTTPoison.get!(url, headers)
   response.body
 end