Tools: fixed quoting for apostrophe in setup-unit.
if test -n ${BASH_VERSION} && test "${BASH_VERSINFO[0]}" -eq 3; then
- >&2 echo 'Your version of bash(1) isn't supported by this script.';
+ >&2 echo "Your version of bash(1) isn't supported by this script.";
>&2 echo "You're probably running on macOS. We recommend that you either";
>&2 echo 'install a newer version of bash(1) or run this script with';
>&2 echo 'another shell, such as zsh(1):';
