add note to readme regarding overlapping matches
add note to readme regarding overlapping matches

freifunk-darmstadt/gluon-firmware-wizard,codedust/gluon-firmware-wizard,codedust/gluon-firmware-wizard,freifunk-darmstadt/gluon-firmware-wizard,freifunk-darmstadt/gluon-firmware-wizard,codedust/gluon-firmware-wizard,freifunk-bielefeld/firmware-wizard,freifunk-bielefeld/firmware-wizard