Update Travis CI notification

.travis.yml

@@ -1,10 +1,10 @@
 language: node_js
 node_js:
-  - node
+- node
 script:
-  - npm run lint
-  - npm run build
-  - npm run test
+- npm run lint
+- npm run build
+- npm run test
 notifications:
   slack:
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