Merge pull request #90 from NativeScript/dtodorov/update-node-xcode-versions

chore: update node version to 8

Author: DimitarTodorov

.travis.yml

@@ -14,15 +14,15 @@ matrix:
       language: android
       os: linux
       jdk: oraclejdk8
-      before_install: nvm install stable
+      before_install: nvm install 8
       script:
         - cd src && npm i && npm run tsc && cd ../demo
         - travis_wait travis_retry tns build android
     - os: osx
       env: 
         - BuildiOS="11"
-        - Xcode="9.3"
-      osx_image: xcode9.3
+        - Xcode="9.2"
+      osx_image: xcode9.2
       language: node_js 
       node_js: "8"
       jdk: oraclejdk8
@@ -35,7 +35,7 @@ matrix:
         - TestVersion="latest"
       jdk: oraclejdk8
       before_install:
-        - nvm install stable
+        - nvm install 8
       before_script:
         - cd seed-tests && npm i
         - echo no | android create avd --force -n test -t android-21 -b armeabi-v7a
@@ -49,7 +49,7 @@ matrix:
       language: node_js
       node_js: "8"
       jdk: oraclejdk8
-      osx_image: xcode9.3
+      osx_image: xcode9.2
       before_script:
         - cd seed-tests && npm i
       script: travis_wait travis_retry npm run test.ios