setLowPowerShutdownTime() usage
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 I am having trouble using this function. Example code below. #include <M5ez.h> 
 #include <M5Stack.h>void setup() { 
 ez.begin();
 M5.Power.begin();
 M5.Power.setLowPowerShutdownTime(ShutdownTime::SHUTDOWN_16S);
 }void loop() { 
 ez.msgBox("M5ez minimal program", "Hello World !", "Settings");
 ez.settings.menu();
 }When I compile I get the error "exit status 1 'ShutdownTime' has not been declared" What am I doing wrong? What I am trying to do is to have the M5Stack Gray stay on for a short time after the USB is unplugged. At the moment when the USB is unplugged the M5 resets and then restarts.