Change nodejs build versions

Semigradsky · Semigradsky · commit 4b129b1c481e · 2019-01-11T15:02:52.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,9 @@
 language: node_js
 
 node_js:
+  - '10'
+  - '8'
   - '6'
-  - '4'
 
 matrix:
   fast_finish: true
