feat: Add blue-green deployment

Author: germanattanasio

.travis.yml

@@ -2,15 +2,27 @@ language: node_js
 dist: trusty
 sudo: required
 node_js: 8
-before_install:
-- openssl aes-256-cbc -K $encrypted_aba75b5b520c_key -iv $encrypted_aba75b5b520c_iv
-  -in .env.enc -out .env -d
-script:
-  - ./.travis_script.sh
 cache:
   directories:
   - node_modules
+env:
+  global:
+  - BX_APP=discovery-news-demo
+  - BX_API=https://api.ng.bluemix.net
+  - BX_ORGANIZATION=WatsonPlatformServices
+  - BX_SPACE=demos
+script:
+- npm run test
+- npm run build
+before_deploy: npm install -g bx-blue-green
 deploy:
+- provider: script
+  skip_cleanup: true
+  script:
+  - bx-blue-green-travis
+  on:
+    branch: master
+    repo: watson-developer-cloud/discovery-nodejs
 - provider: script
   skip_cleanup: true
   script: npx semantic-release