bump travis xcode version

nuclearace · nuclearace · commit 0dc4dd4a93cd · 2019-10-17T06:18:42.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: objective-c
 xcode_project: Socket.IO-Client-Swift.xcodeproj # path to your xcodeproj folder
 xcode_scheme: SocketIO-Mac
-osx_image: xcode10.2
+osx_image: xcode11.2
 branches:
   only:
     - master
