Update version to v0.2.3 #70

Job	Run time
build (examples/AXP192_Example/AXP192_Example.ino)	54s
build (examples/AXP202_Example/AXP202_Example.ino)	1m 3s
build (examples/AXP2101_ADC_Example/AXP2101_ADC_Example.ino)	59s
build (examples/AXP2101_Charge_Example/AXP2101_Charge_Example.ino)	55s
build (examples/AXP2101_Example/AXP2101_Example.ino)	56s
build (examples/AXP2101_InterruptExample/AXP2101_InterruptExample.ino)	1m 0s
build (examples/AXP2101_Sleep_Example/AXP2101_Sleep_Example.ino)	52s
build (examples/AXP2101_Voltage_Example/AXP2101_Voltage_Example.ino)	54s
build (examples/SY6970_Example/SY6970_Example.ino)	52s
build (examples/SY6970_Watchdog_Example/SY6970_Watchdog_Example.ino)	55s
build (examples/XPowersLibInterface_Example/XPowersLibInterface_Example.ino)	56s
build (examples/AXP2101_LowBatteryWarningExample/AXP2101_LowBatteryWarningExample.ino)	52s
	11m 8s

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