chore(package): update semantic-release to version 15.1.2

Closes #41

Author: greenkeeper[bot]

package.json

@@ -76,7 +76,7 @@
     "jest-cli": "^21.0.0",
     "rollup": "^0.48.0",
     "rollup-plugin-babel": "^2.7.1",
-    "semantic-release": "^7.0.1",
+    "semantic-release": "^15.1.2",
     "standard": "^10.0.0",
     "uglify-js": "^3.0.0"
   },