title: Error special characters Google Sheets api v4 with ruby
body: <p>When I add values with special characters (example: ñ) to a Google Sheets api v4 receive this error</p>
  
  <p>I use Ruby 2.5.7 with Sinatra on Windows</p>
  
  <p>This is my code :</p>
  
  <pre><code># encoding: UTF-8
  Encoding.default_external = 'utf-8'
  Encoding.default_internal = Encoding::UTF_8 
  
  require "google_drive"
  require 'google/apis/sheets_v4'
  
  values = [
     ["10000001", "prueba ñ", 100],
  ]
  
  value_range = Google::Apis::SheetsV4::ValueRange.new(values: values)
  result = service.append_spreadsheet_value(spreadsheet_id,
                                            range_name,
                                            value_range,
                                            value_input_option: 'RAW')
  </code></pre>
  
  <blockquote>
    <p>ERROR on service.append_spreadsheet_value : </p>
    
    <p>Encoding::CompatibilityError - incompatible character encodings: CP850 and UTF-8</p>
  </blockquote>