and finally

.travis.yml

@@ -1,11 +1,10 @@
 sudo: false
 language: node_js
-node_js:
-  - "8"
-  - "10"
-  - "6"
 matrix:
   include:
+    - node_js: 8
+    - node_js: 10
+    - node_js: 6
     - python: 2.7
       language: python
       before_script: pip install flake8