fix circle ci node version

yyx990803 · yyx990803 · commit 2e7473c141b6 · 2015-10-01T15:03:38.000-04:00
diff --git a/circle.yml b/circle.yml
@@ -1,3 +1,3 @@
 machine:
   node:
-    version: iojs-v4.0.0
+    version: 4.0.0
