Version 1.5.20

/supplierinvoice/{id}/accounting/: Added field infonote
Minor updates to documentation
Fixed a bug in the endpoints /customerinvoice/{customerinvoice_id}/voucherrows/ and /customerinvoice/{customerinvoice_id}/voucherrows/{voucherrow_id} where wrong rows were returned.
Removed unused endpoints /status/externalworkorder/ and /status/externalworkorder/{id}.
Fixed a bug that caused data in /status/additionalworkorder/ and /status/workorder/ to be mixed up.