chore(package): update semantic-release to version 15.0.2

Closes #4

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "commitizen": "^2.9.6",
     "cz-conventional-changelog": "^2.1.0",
     "husky": "^0.14.3",
-    "semantic-release": "^12.4.1",
+    "semantic-release": "^15.0.2",
     "vue-cli": "^2.8.1",
     "travis-deploy-once": "^4.3.3"
   },