Add Brewfile for dependencies
Adds a brewfile so that developers can run the build-version-list
script locally and get the same behavior as they would on CI.
We need to get bash
from Brew on Macs since the MacOS default version of Bash is very old (see https://apple.stackexchange.com/questions/193411/update-bash-to-version-4-0-on-osx).
Edited by Sarah German