chore(package): update semantic-release to version 15.0.0

Closes #88

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "ghooks": "^2.0.0",
     "istanbul": "^0.4.4",
     "nodeunit": "^0.11.0",
-    "semantic-release": "^7.0.1"
+    "semantic-release": "^15.0.0"
   },
   "config": {
     "ghooks": {