Export array 'errors' on call ended with errors

[bordeo]

When the API call gets an error is useful to have the errors array returned from the call saved into the Mailchimp_Error object so it could be logged and it make more simple to debug error and problems.

mailchimp-lib/src/Mailchimp.php

Line 226 in 13e6271

if(floor($info['http_code'] / 100) >= 4) {

Eg:
API POST /batches
If something went wrong it could returns something like this
{ "type": "http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/", "title": "Invalid Resource", "status": 400, "detail": "The resource submitted could not be validated. For field-specific details, see the 'errors' array.", "instance": "**************", "errors": [ { "field": "operations.item:80", "message": "Schema describes object, array found instead" }, { "field": "operations.item:93", "message": "Schema describes object, array found instead" }, { "field": "operations.item:118", "message": "Schema describes object, array found instead" } ] }