chore(package): update semantic-release to version 8.0.3

Closes #11

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
   "devDependencies": {
     "standard": "^8.1.0",
     "greenkeeper-postpublish": "^1.0.0",
-    "semantic-release": "^6.3.2"
+    "semantic-release": "^8.0.3"
   },
   "homepage": "https://greenkeeper.io",
   "license": "Apache-2.0",