Readme pomodoro is wrong

It seems that the details for the pomodoro is wrong in the readme. On the xxiivv wiki it's described as 20 beats, or 28 minutes and 48 seconds. The readme describes the pomodoro as 30 beats, or 25.92 minutes.

It seems the math for the xxiivv wiki description of a pomodoro is more accurate, the math checks out :D