chore(package): update semantic-release to version 15.13.19 (#91)

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "codecov": "3.4.0",
     "jest": "23.4.1",
     "nodemon": "1.18.11",
-    "semantic-release": "15.13.17",
+    "semantic-release": "15.13.19",
     "smee-client": "1.0.3",
     "standard": "13.1.0"
   },