Build only on node 8 on travis

tusbar · tusbar · commit ad60c47654fb · 2017-08-18T20:53:15.000+02:00
This is a front-end library, no need to test on more versions.
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,6 @@
 language: node_js
 node_js:
-  - "6"
-  - "5"
-  - "4"
+  - "8"
 env:
   - CXX=g++-4.8
 addons:
