chore(package): update semantic-release to version 15.1.5

Closes #169

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "nock": "^9.0.0",
     "npm-run-all": "^4.0.0",
     "rimraf": "^2.4.3",
-    "semantic-release": "^12.2.2",
+    "semantic-release": "^15.1.5",
     "simple-mock": "^0.8.0",
     "standard": "^11.0.0",
     "tap-min": "^1.0.0",