chore(package): update js-yaml to version 3.8.3

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "chai": "^3.5.0",
     "coffee-script": "^1.10.0",
-    "js-yaml": "~3.7.0",
+    "js-yaml": "~3.8.3",
     "fbp": "^1.5.0",
     "mocha": "^3.2.0"
   }