fix "Unexpected fields" in parameter examples

[klausbadelt]

On path parameters with examples the document doesn't validate with ["Unexpected fields: value"]. This is due to probably a typo in Openapi3Parser::NodeFactory::ParameterLike#examples_factory, using NodeFactory::Schema instead of NodeFactory::Example. This PR fixes that.

Example from an OpenApi3 spec:

# openapi.yml
# ...
  '/titles/{title_id}/videos':
    parameters:
      - name: title_id
        in: path
        description: Title ID
        required: true
        schema:
          type: integer
        examples:
          post/201:
            value: 12345

This PR fixes Openapi3Parser.load_file('openapi.yaml').errors resulting in ["Unexpected fields: value"].

[Haelle]

Same here, thanks for the quick fix, you spotted it faster than me !

[kevindew]

Oh great - thanks for catching this. I'll get a new release made for it shortly.

[kevindew]

I've released this as part of version 0.9.0 - thanks again.