in lib/wit.rb [119:124]
def post_entities_keywords(entity, payload)
payload = payload.map {|k, v| [(k.to_sym rescue k), v]}.to_h.reject{ |k| ![:keyword, :synonyms].include?(k) }
validate_payload payload
req(logger, @access_token, Net::HTTP::Post, "/entities/#{URI.encode(entity)}/keywords", {}, payload)
end