Took out extraneous ']' from usage message.
Took out extraneous ']' from usage message.

byterom/android_external_heimdall,byterom/android_external_heimdall,louiskoo/Heimdall,CyanogenMod/android_external_heimdall,RyGuy85/Heimdall,selbyk/Heimdall,selbyk/Heimdall,karabijavad/Heimdall,baerrach/Heimdall,madhatter79/linux,louiskoo/Heimdall,TribeMedia/Heimdall,RyGuy85/Heimdall,CyanogenMod/android_external_heimdall,TribeMedia/Heimdall,karabijavad/Heimdall,byterom/android_external_heimdall,RyGuy85/Heimdall,madhatter79/linux,TribeMedia/Heimdall,karabijavad/Heimdall,selbyk/Heimdall,CyanogenMod/android_external_heimdall,louiskoo/Heimdall,baerrach/Heimdall,madhatter79/linux,baerrach/Heimdall