chore(travis): specify Node 8 for deploy stage

Author: brettstack

.travis.yml

@@ -1,9 +1,10 @@
 language: node_js
+
 node_js:
-  - "4"
-  - "6"
-  - "8"
-  - "node"
+  - 4
+  - 6
+  - 8
+  - node # Latest
 
 jobs:
   include:
@@ -12,6 +13,7 @@ jobs:
         - npm test
     - stage: deploy
       script: skip
+      node_js: 8 # semantic-release requires Node >= 8.3
       # NOTE: Pull Request builds do not run deploy
       deploy:
         provider: script