Merge pull request #226 from NativeScript/hristova/update-travis-xcode-version

chore: update to xcode 10.2

Author: elena-p

.travis.yml

@@ -12,7 +12,7 @@ matrix:
       os: osx
       env:
         - WebPack="iOS"
-      osx_image: xcode10.0
+      osx_image: xcode10.2
       language: node_js 
       node_js: "10"
       jdk: oraclejdk8
@@ -54,7 +54,7 @@ matrix:
       env: 
         - BuildiOS="12.0"
         - Xcode="10.0"
-      osx_image: xcode10.0
+      osx_image: xcode10.2
       language: node_js 
       node_js: "10"
       jdk: oraclejdk8