Merge branch 'dev' into 'master'

Dev

See merge request !431

finance/tasks.py

@@ -77,5 +77,5 @@ def _check_yandex_response_status(invoice, resp_text):
         error = resp_node.getAttribute('error')
         processed_dt = resp_node.getAttribute('processedDT')
         tech_message = resp_node.getAttribute('techMessage')
-        invoice.status += 'C'  # Invoice.BILL_STATUSES[-1][0]
+        invoice.status = Invoice.BILL_STATUSES[-1][0]
         invoice.comment += 'Yandex Money: ошибка № {}, сообщение {} от {}'.format(error, tech_message, processed_dt)