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+2024-01-11	v0.4.0 use new ACK messages instead hw-flow control
 2020-05-01	v0.3.5 use gnu99 instead of gnu11, add O_NDELAY to serial port initialization
 2020-04-08	v0.3.4 removed hw flow control for mac and bsd
 2020-04-06	v0.3.3 fixed progressbar for files smaller than 256 bytes