Update updater.sh

Solution based off [here](https://stackoverflow.com/questions/3572030/bash-script-absolute-path-with-osx)
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overdodactyl 2017-11-25 15:56:45 +00:00 committed by GitHub
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@ -10,9 +10,12 @@ echo -e "\nThis script should be run from your Firefox profile directory.\n"
currdir=$(pwd)
## get the full path of this script (greadlink for Mac, readlink for Linux)
## greadlink is dependent on the package coreutils: brew install coreutils
scriptfullpath=$(greadlink -f "${BASH_SOURCE[0]}" 2>/dev/null || readlink -f "${BASH_SOURCE[0]}")
realpath_osx() {
[[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
}
## get the full path of this script (readlink for readlink for Linux)
scriptfullpath=$(readlink -f "${BASH_SOURCE[0]}" 2>/dev/null || realpath "$0")
## change directory to the Firefox profile directory
cd "$(dirname "${scriptfullpath}")"