updated struct GetTransactionListResponse

[olegromanchuk]

Please, check that if you have a chance:

If you go to:
https://developer.authorize.net/api/reference/index.html#transaction-reporting-get-transaction-list
the original Response has a section "getTransactionListResponse". But if you press a "Send" button this section (getTransactionListResponse) disappeared. This is what I've got trying to use your package: a response without "getTransactionListResponse".

So, these are changes which were made to get it working:

Updated "GetTransactionListResponse" to match current Auth.Net's "getTransactionListResponse".
A response from Auth.Net failed to unmarshal on line 80 in transaction_reporting.go

err = json.Unmarshal(response, &dat)

Current Auth.Net response from
https://developer.authorize.net/api/reference/index.html#transaction-reporting-get-transaction-list

{
"transactions": [
{
"transId": "60106385658",
"submitTimeUTC": "2018-07-26T14:38:17Z",
"submitTimeLocal": "2018-07-26T07:38:17",
"transactionStatus": "settledSuccessfully",
"firstName": "Ellen",
"lastName": "Johnson",
"accountType": "MasterCard",
"accountNumber": "XXXX0015",
"settleAmount": 5,
"marketType": "eCommerce",
"product": "Card Not Present"
}
],
"totalNumInResultSet": 1,
"messages": {
"resultCode": "Ok",
"message": [
{
"code": "I00001",
"text": "Successful."
}
]
}
}