Charset ks_c_5601-1987 is not supported

[shivamd]

mikel/mail#436
As per the comments, I believe this can be mapped to EUC-KR

Currently CharDet doesn't support this encoding.
Thoughts?

[grosser]

sounds right, make a PR :)

[shivamd]

Great, will do.

[jimmysoho]

Just ran into this one too. We are on ruby 2.3.1. The fix was made in Mail::Ruby19 Ruby19.pick_encoding. But it seems this fix is also needed in ruby 2.x.

[grosser]

not sure what this bug is about, but I suggest you make a PR ;D