chore(package): update msgflo to version 0.12.3

Closes #40

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "coffee-script": "^1.8.0",
     "mocha": "^5.0.0",
     "mqtt": "^2.13.0",
-    "msgflo": "^0.11.0"
+    "msgflo": "^0.12.3"
   },
   "keywords": [],
   "bin": {},