try bumping npm v in circle.yml to 6.0.0

Kully · Kully · commit 0482dce629c0 · 2018-03-06T06:47:24.000-05:00
diff --git a/circle.yml b/circle.yml
@@ -12,7 +12,7 @@ machine:
 
   node:
     # use a pre-installed version of node so we don't need to download it.
-    version: 4.2.2
+    version: 6.0.0  # 4.2.2
 
 dependencies:
 
