Update Node in Travis

Author: wooorm

.travis.yml

@@ -1,7 +1,7 @@
 language: node_js
 node_js:
 - '4.0'
-- '8.0'
+- '9.0'
 after_script: bash <(curl -s https://codecov.io/bash)
 deploy:
   - provider: npm
@@ -10,7 +10,7 @@ deploy:
       secure: 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
     on:
       tags: true
-      node: '4.0'
+      node: '9.0'
   - provider: releases
     api_key:
       secure: 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
@@ -19,4 +19,4 @@ deploy:
       - "unist-util-assert.min.js"
     on:
       tags: true
-      node: '8.0'
+      node: '9.0'