add support for CJK?

[WankkoRee]

in CJK, a char occupies two chars width.

So I want it formatted like this:

Before

type Test struct {
	NormalChars string `json:"normalChars" t:"abc" othertag:"123"`
	CjkChars    string `json:"cjkChars"    t:"中の한" othertag:"456"`
}

After

type Test struct {
	NormalChars string `json:"normalChars" t:"abc"    othertag:"123"`
	CjkChars    string `json:"cjkChars"    t:"中の한" othertag:"456"`
}

but beacuse of fonts, it may not be strictly aligned visually.

[momaek]

It's a bug. I'm trying to fix it.