Node v7 has been supplanted by Node v8 (#921)

Node v7 has been supplanted by Node 8

Author: leebyron

.travis.yml

@@ -2,7 +2,7 @@ language: node_js
 
 # https://github.com/nodejs/LTS
 node_js:
-  - '7'
+  - '8'
   - '6'
   - '4'
 
@@ -29,7 +29,7 @@ jobs:
   include:
     - stage: Deploy
       script: echo "Deploying..."
-      node_js: '7'
+      node_js: '8'
       deploy:
         - provider: script
           script: npm run gitpublish