Add poll_interval option for Client

[kolasss]

set interval for long-polling

[atipugin]

Hi @kolasss,

why do you want to set interval between polling attempts? And why it should be inside #fetch_updates? If for some reason you want to customize polling behavior, you can use your own polling loop:

def do_polling(client)
  loop do
    puts "Polling..."
    client.fetch_updates do |message|
      puts message.inspect
    end

    sleep 1
  end
end

do_polling(Telegram::Bot::Client.new(token))

[kolasss]

@atipugin just a suggestion, I think could be usefull for some people I use interval for 1 second in my code

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