ERROR Rack::Lint::LintError: Body yielded non-string value {:id=>100,

test.ru
```ruby
require 'newark'

class App

  include Newark

  before do
    headers['X-Newark-Version'] = Newark::VERSION
  end

  get  '/' do 
  
   body={:id=>100,:title=>"test body respond_to"}
   
   print body.respond_to?(:to_hash) 
  
   body

  end 

 
end

run App.new

```
