Log Message:
py-stdnum: updated to 1.9

Changes from 1.8.1 to 1.9:
* add modules for the following number formats:
  - Postleitzahl (Austrian postal code)
  - Abgabenkontonummer (Austrian tax identification number)
  - Belgian IBAN (International Bank Account Number)
  - Handelsregisternummer (German company register number)
  - St.-Nr. (Steuernummer, German tax number)
  - FIGI (Financial Instrument Global Identifier)
  - Montenegro IBAN (International Bank Account Number)
* Have documentation rebuilt reproducibly
* Allow configuring the SOAP request timeout
* Support spaces in ISO 9362 (SWIFT) BIC codes
* Add check_dgii() to stdnum.do.cedula module
* Add validation for "individual" part of hetu
* Support new style of Dominican Republic NCF numbers
* Fix issue when using PySimpleSOAP for DGII lookups
* Fix an issue in splitting certain IMSI values
* Support building a universal wheel
* Documentation and code style improvements