"Czechia" is the official short English name for "The Czech Republic". It is "czech" here.

[WillJonesMapular]

Sources:

• https://assets.publishing.service.gov.uk/media/5a8198a1e5274a2e87dbe79f/Czechia_Information_Paper-Updated_September_2016.pdf

• https://mzv.gov.cz/london/en/about_the_czech_republic/basic_information_on_the_czech_republic/index.html

[georgique]

Sorry, a bit busy these days. Feel free to submit a pull request with the necessary changes. But if you do, please consider people who already use the old name, it has to have backwards compatibility.

[georgique]

Added czechia.json in 41f1bc6
Will delete czech.json in the next major version, keep it now for compatibility.