[ietf-languages-announcements] Update to the language subtag registry

[Amanda Baber]

IANA has updated the language subtag registry to include variant subtag "peano." Please see

https://www.iana.org/assignments/language-subtag-registry

https://www.iana.org/assignments/lang-subtags-templates

Best regards,

Amanda Baber
Lead IANA Services Specialist
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