Update the version of Xcode from 9.2.0 to 10.1.0 on CircleCI

Author: lyuich

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 
 defaults: &defaults
   macos:
-    xcode: "9.2.0"
+    xcode: "10.1.0"
   working_directory: /Users/distiller/project
   environment:
     FL_OUTPUT_DIR: /Users/distiller/project/output