chore(package): update travis-deploy-once to version 5.0.3

Closes #26

Author: greenkeeper[bot]

package.json

@@ -77,7 +77,7 @@
     "nsp": "3.1.0",
     "semantic-release": "15.0.0",
     "standard-version": "4.3.0",
-    "travis-deploy-once": "4.3.4"
+    "travis-deploy-once": "5.0.3"
   },
   "engines": {
     "node": ">=8.0.0"