the starterkit wasn't downloaded because

[Gregory-Phillips]

I just started the Read Me walk-through and installed composer and following the steps for loading the starterkit using option:1
It gets through the set up for: Installing pattern-lab/edition-mustache-standard (v2.0.0)
However after the initial install and the option prompt for option 1 or option 2.
Choosing option 1 generated this error:

  date_default_timezone_get(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone.