chore(package): update semantic-release to version 12.2.4

Closes #19

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "mocha": "3.4.2",
     "nodemon": "1.9.2",
     "nyc": "11.0.2",
-    "semantic-release": "6.3.6",
+    "semantic-release": "12.2.4",
     "serve-favicon": "2.4.3",
     "strong-error-handler": "2.1.0"
   },