Travis: Use Node.js 6

jonnor · jonnor · commit d16ae14379b1 · 2017-12-31T03:31:44.000+01:00
microflo 0.4+ requires it
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-- '4.2'
+- '6'
 sudo: true
 before_install:
 - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
