chore(ci): Setup semantic release (#38)

.travis.yml

@@ -2,7 +2,7 @@ language:
   - node_js
 
 node_js:
-  - 7
+  - 8
   - 6
   - 4
 
@@ -20,29 +20,16 @@ branches:
 notifications:
   slack: smartcar:PGJmjtKFPytU5E2FwsImdVp8
 
-before_install:
-  - git clone [email protected]:smartcar/build.git $HOME/smartcar-build
-  - cp $HOME/smartcar-build/resources/Makefile .
-
 install:
-  - npm update
+  - npm update --save false
   - npm prune
 
 script:
   - npm test
   - npm run cover
-  - if [ $TRAVIS_NODE_VERSION = 6 ]; then make create-tag; fi
 
-deploy:
-  - provider: npm
-    email: [email protected]
-    api_key: $NPM_API_TOKEN
-    on:
-      branch: master
-      node: 6
-  - provider: script
-    skip_cleanup: true
-    script: make push-tag
-    on:
-      branch: master
-      node: 6
+jobs:
+  include:
+    - stage: publish
+      node_js: 8
+      script: npm run release