chore(package): update msgflo to version 0.12.1

Closes #26

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
     "chai": "^4.1.2",
     "coffee-script": "^1.8.0",
     "mocha": "^5.0.0",
-    "msgflo": "^0.10.0",
+    "msgflo": "^0.12.1",
     "mqtt": "^2.15.0"
   },
   "keywords": [],