CircleCI: specify xcode version

2019-12-28 01:00:28 +00:00 · 2019-12-28 01:00:28 +00:00 · 196f17277c
commit 196f17277c
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@ -2,6 +2,8 @@ version: 2
 jobs:
  build:
    macos:
+      xcode: "10.2.0"
+
    steps:
      - checkout
      - run: