Load yaml file for openapi2

[ilteoood]

Hi guys, thank you so much for this awesome library.

I'm opening this issue just to ask a question: is a way to load an openapi2 specification from a yaml file?

Currently I'm:

• loading it;
• converting it to JSON;
• using the UnmarshalJSON method to fill the openapi2.T object.

Is there a better way? Because the convertion yaml 2 json is a little bit heavy for large specifications.

[fenollp]

Have a look at https://github.com/ghodss/yaml

And if you have the time I'd happily review a pull request that solves this for others, be it only an example.

[fenollp]

See https://github.com/getkin/kin-openapi/blob/0a4abfc91ea65332d247587bda355ab2ed461ef0/openapi2/openapi2_test.go#L45