chore(package): update semantic-release to version 15.6.2

Closes #202

Author: greenkeeper[bot]

package.json

@@ -89,7 +89,7 @@
     "rollup-plugin-commonjs": "9.1.3",
     "rollup-plugin-node-resolve": "3.3.0",
     "sinon": "6.0.0",
-    "semantic-release": "15.5.4"
+    "semantic-release": "15.6.2"
   },
   "release": {
     "branch": "master",