chore(deps): update dependency semantic-release to v15.1.4

Author: renovate-bot

package.json

@@ -51,7 +51,7 @@
     "cucumber": "3.2.1",
     "graphql": "0.13.1",
     "nyc": "11.4.1",
-    "semantic-release": "12.4.1",
+    "semantic-release": "15.1.4",
     "ts-node": "5.0.0",
     "typescript": "2.7.2"
   },