Merge pull request #118 from NativeScript/dtodorov/update-node-version

chore: upate node version to 8

Author: Zdravko

.travis.yml

@@ -15,23 +15,23 @@ matrix:
     - stage: "Lint"
       language: node_js
       os: linux
-      node_js: "6"
+      node_js: "8"
       script: cd src && npm run ci.tslint && cd ../demo && npm run ci.tslint && cd ../demo-angular && npm run ci.tslint
     - stage: "WebPack and Build"
       os: osx
       env:
         - WebpackiOS="11"
       osx_image: xcode9.2
       language: node_js 
-      node_js: "6"
+      node_js: "8"
       jdk: oraclejdk8
       script: cd src && npm run build.iosOnly && cd ../demo && npm i && tns build ios --env.uglify && cd ../demo-angular && npm i && tns build ios --env.uglify --env.aot
     - language: android
       os: linux
       env:
         - WebpackAndroid="26"
       jdk: oraclejdk8
-      before_install: nvm install 6
+      before_install: nvm install 8
       script:
         - cd src && npm run build && cd ../demo && npm i && tns build android --env.uglify --env.snapshot
         - cd ../demo-angular && npm i && tns build android --env.uglify --env.snapshot --env.aot
@@ -40,7 +40,7 @@ matrix:
         - BuildAndroid="26"
       os: linux
       jdk: oraclejdk8
-      before_install: nvm install 8.9.4
+      before_install: nvm install 8.11.4
       script:
         - cd demo && npm run ci.android.build && cd ../demo-angular && npm run ci.android.build
         - "curl -u $SAUCE_USER:$SAUCE_KEY -X POST -H 'Content-Type: application/octet-stream' $ANDROID_SAUCE_STORAGE --data-binary @$ANDROID_PACKAGE_FOLDER/app-debug.apk"
@@ -61,7 +61,7 @@ matrix:
         - Android="23"
       language: node_js
       os: linux
-      node_js: "6"
+      node_js: "8"
       script:
         - npm i -g appium
         - cd demo && npm i
@@ -70,7 +70,7 @@ matrix:
       env: 
         - iOS="10"
       language: node_js 
-      node_js: "6"
+      node_js: "8"
       script: 
         - npm i -g appium
         - cd demo && npm i