setWakeupButton
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 Hello. At examples i see function "M5.setWakeupButton(BUTTON_A_PIN);" How i can use it? After "turnOff();" i see at port: "Enabling EXT1 wakeup on pins GPIO39 
 On deep sleep mode." I try wake up M5 but cant. For what this function M5.setWakeupButton(BUTTON_A_PIN) ?
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 @mifos 在 setWakeupButton 中说: 
 .. I try wake up M5 but cant.
 The same problem: wake up button is not operatable
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 @vvs551 在 setWakeupButton 中说: operatable sorry the to late see this, this problem is fix at latest library version. 
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 This is a hardware problem of the IP5306 buck converter going into standby after 32 seconds. 
 It is explained in this thread:
 http://forum.m5stack.com/topic/62/ip5306-automatic-standby

