add node versions 8 to 10 to travis

Salakar · web-flow · commit 9d342cce579a · 2018-04-25T07:58:36.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -12,6 +12,9 @@ node_js:
   - "4"
   - "6"
   - "7"
+  - "8"
+  - "9"
+  - "10"
 install:
   - npm install
   - npm install hiredis
