.travis.yml in xcknife-0.10.0 vs .travis.yml in xcknife-0.11.0

@@ -1,14 +1,10 @@
 language: objective-c
 sudo: false
 matrix:
   include:
     - os: osx
-      osx_image: xcode8
-    - os: osx
-      osx_image: xcode8.1
-    - os: osx
-      osx_image: xcode8.2
+      osx_image: xcode10.2
 
 before_script:
   - export LANG=en_US.UTF-8
 install: bundle
 script: