chore(package): update semantic-release to version 8.0.0

Closes #20

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
     "husky": "^0.13.3",
     "jest": "^20.0.3",
     "lint-staged": "^3.4.2",
-    "semantic-release": "^6.3.6",
+    "semantic-release": "^8.0.0",
     "ts-jest": "^20.0.4",
     "tslint": "^5.0.0",
     "typedoc": "^0.7.1",