Fix Open Api: issue with multiple required fields

[rennanoliveira]

Issue #429
When multiple required fields were set, only one of them would show on the Open Api schema.
The required list would only be populated by the first required value.
This PR changes it so that multiple required values are able to be set on the schema

before:

fields.each do |field|
#...
  current[:required] ||= [] << field[:name] if field[:required]
end

after:

fields.each do |field|
#... 
  if field[:required]
    current[:required] ||= []
    current[:required] << field[:name]
  end
end

[rennanoliveira]

Hello @oestrich

Does this fix make sense to you? Is there anything you feel needs change on this?

[oestrich]

Looks good. Thanks! Sorry for the delay

[StanisLove]

It will be great if such fixes are released