Update all stuff that requires updating

scripts/system-update.sh

 echo "Downloading and installing recommended system updates..."
-softwareupdate --install --verbose \
-               --ignore "iTunes" \
-               --ignore "iBooks Update" \
-               --ignore "macOS High Sierra"
+softwareupdate --install --verbose --recommended
 
 # We don't want our system changing on us or restarting to update. Disable
 # automatic updates.