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

Closes #8

Author: greenkeeper[bot]

package.json

@@ -7,7 +7,7 @@
     "yargs": "^8.0.1"
   },
   "devDependencies": {
-    "semantic-release": "^6.3.2",
+    "semantic-release": "^15.0.0",
     "standard": "^10.0.0",
     "tape": "^4.0.0"
   },