chore(package): update semantic-release to version 15.0.1

Closes #16

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
         "jest-cli": "^20.0.4",
         "js-yaml": "^3.8.4",
         "nsp": "^2.6.3",
-        "semantic-release": "^6.3.2",
+        "semantic-release": "^15.0.1",
         "semantic-release-cli": "^3.0.3",
         "yeoman-assert": "^3.0.0",
         "yeoman-test": "^1.5.1"