Feature: Support flat YAML

[Bigyls]

Hello,

I'm having a problem with a YAML file that I call flat:

name: Test
author: Me
category: YAML

And when I try to create my schema I get the following error when launching the action:

name:
  type: string
  description: Name of the yaml value
  required: true
...

Error: workflow is not valid. 'schema.yml': yaml: unmarshal errors:
  line 3: cannot unmarshal !!map into string

Does anyone have an idea? I have the impression that this error is due to the handling of https://github.com/ketanSaxena/schema-validator