sms_get_campaign_cost always returns an error

[vhartikainen]

Calling sms_get_campaign_cost(sender='SENDER', body='Lorem ipsum', phones=['+35840133333']) or with addressbook_id, will always return error:
Address book or phone list must be specified

Could it be that the payload is missing route parameter, although it's marked as optional in SendPulse API?

sendpulse-rest-api-python/pysendpulse/pysendpulse.py

Lines 1162 to 1166 in e66efb9

	data_to_send = {
	'sender': sender,
	'body': body,
	'addressBookId': addressbook_id
	}