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Update countries.yml
China area code regex
I guess this Wikipedia article on the structure of phone numbers used in China says that this regex is alright?
https://en.wikipedia.org/wiki/Telephone_numbers_in_China
@oiahoon Perhaps you can edit the title of this Pull Request to explain what it does? "Update countries.yml" does not explain, but the description does. Perhaps you can use the description to create a title?