mem: print zero used_mem instead of negative used_mem (#722)
mem: print zero used_mem instead of negative used_mem (#722)


facetoe/i3pystatus,facetoe/i3pystatus,enkore/i3pystatus,drwahl/i3pystatus,Arvedui/i3pystatus,enkore/i3pystatus,Arvedui/i3pystatus,drwahl/i3pystatus