Update Node in Travis

Author: wooorm

.travis.yml

@@ -1,15 +1,15 @@
 language: node_js
 node_js:
-- lts/boron
-- node
+  - lts/dubnium
+  - node
 after_script: bash <(curl -s https://codecov.io/bash)
 deploy:
   provider: releases
   skip_cleanup: true
   api_key:
     secure: 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
   file:
-    - "unist-util-source.js"
-    - "unist-util-source.min.js"
+    - 'unist-util-source.js'
+    - 'unist-util-source.min.js'
   on:
     tags: true