Retrieve response headers from gocardless

[matt-fidd]

Is your feature request related to a problem? Please describe.
With the impending rate limit changes, there will be no way to fetch data from the new informational headers.

    HTTP_X_RATELIMIT_LIMIT: Indicates the maximum number of allowed requests within the defined time window.
    HTTP_X_RATELIMIT_REMAINING: Shows the number of remaining requests you can make in the current time window.
    HTTP_X_RATELIMIT_RESET: Provides the time remaining in the current window.
    HTTP_X_RATELIMIT_ACCOUNT_SUCCESS_LIMIT: Indicates the maximum number of allowed requests within the defined time window.
    HTTP_X_RATELIMIT_ACCOUNT_SUCCESS_REMAINING: Shows the number of remaining requests you can make in the current time window.
    HTTP_X_RATELIMIT_ACCOUNT_SUCCESS_RESET: Provides the time remaining in the current window.

Describe the solution you'd like
A way to retrieve the response headers along with the data when using the API.

Below are a couple of ideas I've had as to how this could be implemented:

nordigen-node/lib/index.js

Line 91 in 9d535ca

return response.data;

becomes:

without breaking change:

return {
  ...response.data,
  headers: response.headers,
}

with breaking change:

return {
  data: response.data,
  headers: response.headers,
}