No option to use yaml_emitter_set_unicode

[Ashwin Purohit]

There is no option to use yaml_emitter_set_unicode, although it is defined in encode.go. That means when I have an input file like:

line: 你好

And I unmarshal and re-marshal it, when I write it to a file I will get:

line: "\u4F60\u597D"

which is unexpected -- I prefer the unescaped version.

When I add this line as L20 in encoder.go:

yaml_emitter_set_unicode(&e.emitter, true)

The problem is resolved, and line: 你好 displays normally on output. At the very least, there should be an option to yaml_emitter_set_unicode(..., true), otherwise I have to keep a forked repo!