Update Node in Travis

Author: wooorm

.travis.yml

@@ -1,7 +1,7 @@
 language: node_js
 node_js:
 - '4.0'
-- '7.0'
+- '8.0'
 after_script: bash <(curl -s https://codecov.io/bash)
 sudo: false
 deploy:
@@ -11,7 +11,7 @@ deploy:
       secure: DXH+0jJsbxpj66ehrc1YWRjKfj1adNoQGpzT8jmq6vv61HAaIbGe2Uk4iQw2KAw5OWfvjbdHzLhkWloZIJqyQ7Y5SjHZwReRnhNyj2h7/huWa8cnhYbU8B+WAmpbvcl8aWZPvq1ls6CZwE+33AUSGZxMEGauxooRNSgNq9jIx88=
     on:
       tags: true
-      node: '4.0'
+      node: '8.0'
   - provider: releases
     api_key:
       secure: Z3ndWZ8hPYQhKBkHqWVmt7i/KrZ9KjGoD9KxMJNyEfXgXkaTOsFtg8iCsHoA4GSRJPw1M/EjklDNOSEPkF9rhAyilX6ThqMO764IEr4i6zXyVd//UyCsw5Qq/wOCftZGwbDyNP2I3cD9mesQRHDp1dpZTy4Hy2Bp/3PajYsbP3g=
@@ -20,4 +20,4 @@ deploy:
       - "nlcst-emoticon-modifier.min.js"
     on:
       tags: true
-      node: '7.0'
+      node: '8.0'