Log Message:
py-stdnum: updated to 1.16

changes from 1.15 to 1.16
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* Support XI country code for Northern Ireland VAT numbers
* Switch data source for Austrian postal codes
* Fix Belarus VAT number online lookup

changes from 1.14 to 1.15
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* Add modules for the following number formats:
  - CUI or CIF (Codul Unic de Înregistrare, Romanian company identifier)
  - PEID (Liechtenstein tax code for individuals and entities)
  - ЄДРПОУ, EDRPOU (Identifier for enterprises and organizations in Ukraine)
  - РНОКПП, RNTRC (Individual taxpayer registration number in Ukraine)
* Make list of EU member states part of public API
* Retain RO prefix in Romanian VAT numbers
* Support international VAT numbers that are only valid with country prefix
* Expanded validation for Belgian VAT numbers
* Use ABN as Australian VAT number
* Remove GB from EU member states