Update lint node

vhf · vhf · commit 10fef8c1dfa2 · 2017-03-04T14:59:14.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 sudo: false
 node_js:
-  - "4.1"
+  - 6
 before_script:
   - npm install -g free-programming-books-lint
 script: fpb-lint .
