Rename zh.json to zh_CN.json

[yf-hk]

This is for simplified Chinese so the correct locale should be zh_CN. For traditional Chinese it should be something like zh_HK or zh_TW.

[coveralls]

Coverage remained the same at 100.0% when pulling e41cc24 on andyhu:patch-1 into 2a73ed4 on yargs:master.

[bcoe]

@andyhu thank you. I have a concern though, this could break existing apps that were relying on the zh locale name; perhaps we should just have two locale files? zh.json and zh_CN.json?

[yf-hk]

Hi @bcoe, I have the same concern. However I'm a Chinese native speaker and I've never used the locale string 'zh' since it's quite different between Traditional Chinese and Simplified Chinese. As Chinese we can understand both of them though. Or maybe we can change it until next major release after something like zh_TW is available?

[bcoe]

@andyhu let's just keep zh.json and zh_CN.json and in the next major we'll drop zh.json.

[yf-hk]

thanks @bcoe

[bcoe]

@andyhu mind submitting a pull with both files, then I can give you credit for the work when I merge.

[bcoe]

@andyhu thank you for the contribution \o/ closing in favor of #519 which keeps zh.json, and adds zh_CN.json.

[bcoe]

@andyhu give this a spin, I've landed your changes finally:

npm cache clear; npm i yargs@next