Update node_js version to 8

dkamburov · dkamburov · commit 26c131e331b1 · 2018-05-09T15:38:00.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-- '5'
+- '8'
 before_install:
 - export CHROME_BIN=chromium-browser
 - export DISPLAY=:99.0
