Missing estimated settlement time and settlement status in transaction object

[guzpr]

https://developers.xendit.co/api-reference/#transaction-object

Missing settlement time and settlement status on transaction object. This field is useful for reconciliation especially for cards payment

[rjjatson]

i also need the settlement information, so im proposing a fix here
#128

would be happy if you could review the PR @adityarx

[adityarx]

Merged and released in v1.0.20 @rjjatson @guzpr. Thanks @rjjatson for your fix 🙏