chore(package): update semantic-release to version 16.0.4

Closes #14

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "last-release-github": "1.1.1",
     "mocha": "4.0.1",
     "pre-git": "3.15.3",
-    "semantic-release": "7.0.2",
+    "semantic-release": "16.0.4",
     "testdouble": "3.2.6"
   },
   "config": {