Merge pull request #175 from NativeScript/dtodorov/xcode-10

chore: bump xcode to 10, add pip install scripts

Author: DimitarTodorov

.travis.yml

@@ -12,7 +12,7 @@ matrix:
       os: osx
       env:
         - WebPack="iOS"
-      osx_image: xcode9.2
+      osx_image: xcode10.0
       language: node_js 
       node_js: "8"
       jdk: oraclejdk8
@@ -50,9 +50,9 @@ matrix:
         - cd src && npm i && npm run tsc && cd ../demo && npm i && tns build android && cd ../demo-angular && npm i && tns build android
     - os: osx
       env: 
-        - BuildiOS="11"
-        - Xcode="9.2"
-      osx_image: xcode9.2
+        - BuildiOS="12.0"
+        - Xcode="10.0"
+      osx_image: xcode10.0
       language: node_js 
       node_js: "8"
       jdk: oraclejdk8
@@ -69,7 +69,11 @@ android:
     - android-23
     - extra-android-m2repository
 
+before_install:
+    - sudo pip install --upgrade pip
+    - sudo pip install six
+
 install:
     - echo no | npm install -g nativescript
     - tns usage-reporting disable
-    - tns error-reporting disable
+    - tns error-reporting disable