`text_content` is actually `textContent`

[freesteph]

The documentation defines text_content and html_content but this does not work:

Brevo::TransactionalEmailsApi
  .new
  .send_transac_email(
    sender: { name: "Foo", email: "foo@bar.com" },
    to: [{ email: "foo@bar.com" }],
    text_content:  "Some text",
    subject: "Hi"
  )

which yields: {"code":"missing_parameter","message":"Either of htmlContent or textContent is required"}.

Changing the param to textContent fixes the issue.