How to pass organization header?

[Boscop]

Thanks for making this crate, it seems very useful :)

Btw, on https://platform.openai.com/account/api-keys it says:

https://platform.openai.com/docs/api-reference/requesting-organization says:

Requesting organization

For users who belong to multiple organizations, you can pass a header to specify which organization is used for an API request. Usage from these API requests will count against the specified organization's subscription quota.
Example curl command:

curl https://api.openai.com/v1/models \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "OpenAI-Organization: org-Q4qnf6HKZtLiqUySAB41oMeY"

Could you please add this header functionality to this crate, so that we can select the org? :)

[dongri]

#28
Add new_with_organization

@Boscop The new_with_organization function is available in v0.1.15

[Boscop]

Thanks :)