bug with yaml long string

[sters]

bug with yaml long string

[sters]

@zhaogaolong

I fixed partially this issue. It is string handling issue when dump diff.
ref. 80c22c7

So far, this yaml-diff only handles key-value pair and structure. It means showing "There is a diff in the key" even if there is multiline strings.
This is because go-yaml that is yaml parser used in yaml-diff only has the information that it is a string. Maybe a custom type could be used to get a more detailed diff as you mentioned, with the information that it is a multi-line string. Or, maybe re-calculate detailed diff if the diff is in string values in dump phase.