chore(package): update standard-version to version 5.0.0

Closes #42

Author: greenkeeper[bot]

package.json

@@ -76,7 +76,7 @@
     "markdown-magic-package-scripts": "1.2.1",
     "nsp": "3.1.0",
     "semantic-release": "15.0.0",
-    "standard-version": "4.3.0",
+    "standard-version": "5.0.0",
     "travis-deploy-once": "4.3.4"
   },
   "engines": {