Support Swiss postal codes

[biodranik]

https://www.swisstopo.admin.ch/fr/repertoire-officiel-des-localites#R%C3%A9pertoire-des-localit%C3%A9s---Download

This may help with testing )

[rtsisyk]

Thank for reporting this issue. As you may know, we have a project funded by NLNet to fix issues with the postcodes. However, it doesn't include Switzerland in the scope. We aimed to fix postcodes in the UK (and we probably have delived already). In addition the U.K. we have also improved postcodes to the U.S. Let's address Swiss in the next phrase. It is not such critical as for the U.K., where people literally remember and type post codes on the everyday basis.