YAML to JSON conversion unnecessary and broken

[doismellburning]

CloudFormation now supports YAML templates natively, rendering cfn-flow's "converts from YAML to JSON" obsolete

In addition, CloudFormation Intrinsic Functions have a YAML "short form" (e.g. !GetAtt foo.bar) that cfn-flow naïvely transforms to JSON, turning a valid CF YAML template into invalid CF JSON

(If you confine yourself to the "long form" of the functions, it's fine)

[ktheory]

@doismellburning Yup! Totally correct. I'd welcome a PR to removes the conversion to JSON.