chore(ci): Use node 8 (#959)

posva · ktsn · commit 7d9730edd2ab · 2017-09-18T22:22:33.000+09:00
diff --git a/circle.yml b/circle.yml
@@ -1,5 +1,5 @@
 machine:
   node:
-    version: 5
+    version: 8
   environment:
     BABEL_ENV: development
