sysfs: change power supply scope to string (#145)
sysfs: change power supply scope to string (#145)

/sys/class/power_supply/<power_supply>/scope is currently parsed as
uint64, but is is actually a string.

Signed-off-by: Sven Haardiek <c5f4db14e726103fe12e30277df16e9a9e8f6196@iotec-gmbh.de>

prometheus/procfs,prometheus/procfs