chore(CI): test use build matrix

.travis.yml

@@ -3,27 +3,14 @@ node_js:
   - "8"
   - "6"
   - "4"
+script: npm run lint && npm test
 jobs:
   include:
-    - stage: test
-      name: 'Linting'
-      node_js: "8"
-      script: npm run lint
-    - name: 'Unit Test'
-      node_js: "8"
-      script: npm run unit && npm run coveralls
-    - name: 'E2E Test'
-      script: npm run e2e
-
-    - stage: build
-      node_js: "8"
-      script: npm run build
-
+    - stage: coverage
+      script: npm run coverage && npm run coveralls
     - stage: release
       if: branch = master
-      node_js: "8"
       script: skip
       deploy:
         provider: script
-        skip_cleanup: true
         script: npx semantic-release