Add Safari 11 Intl updates
Add Safari 11 Intl updates

Safari 11 added DateTimeFormat.prototype.formatToParts, Collator's caseFirst option, and the Intl.getCannonicalLocales function.
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,teoli2003/browser-compat-data,chrisdavidmills/browser-compat-data