chore(package): update js-yaml to version 3.12.2

Closes #16

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "chai": "^4.0.2",
     "coffee-script": "^1.10.0",
-    "js-yaml": "~3.10.0",
+    "js-yaml": "~3.12.2",
     "fbp": "^1.5.0",
     "mocha": "^5.0.0"
   }