Move min Xcode version to 10.3

Xcode 10.1 has a compiler bug that breaks on generated code.
Xcode 10.3+ appear to be fine.

dmaclach committed 6y ago

6f9d48814928d99c079ac2dcbd4c2a50d6e97915

Parent: effb65d

Committed by Thomas Van Lenten <thomasvl@google.com> on 1/23/2020, 9:43:00 PM