filename_from_header compatibility

[ghost]

{"cache-control"=>"private", "content-type"=>"binary/octet-stream", "server"=>"Microsoft-IIS/8.5", "content-disposition"=>"attachment; filename=13134102.pdf; size=426665", "x-powered-by"=>"ASP.NET", "date"=>"Fri, 04 Jan 2019 15:20:47 GMT", "content-length"=>"426665"}

support above file meta.

    def filename_from_header
      if file.meta.include? 'content-disposition'
        match = file.meta['content-disposition'].match(/filename="?([^"|;]+)/)
        return match[1] unless match.nil? || match[1].empty?
      end
    end