`UTF-16BE` encoding is detected instead of `ISO-8859-1`

[ilyazub]

ISO-8859-1 encoding is not detected for the following case:

content = "R\xE9sum\xE9"
detection = CharlockHolmes::EncodingDetector.detect content
# => {:type=>:text, :encoding=>"UTF-16BE", :ruby_encoding=>"UTF-16BE", :confidence=>10}
# Expected – ISO-8859-1

utf8_encoded_content = CharlockHolmes::Converter.convert content, detection[:encoding], 'UTF-8'
# => "勩獵淩"

# Expected
content.encode(Encoding::UTF_8, Encoding::ISO_8859_1)
# => "Résumé"