fix: upgrade xo from 0.28.0 to 0.28.1 (#92)

Snyk has created this PR to upgrade xo from 0.28.0 to 0.28.1.

See this package in NPM:
https://www.npmjs.com/package/xo

See this project in Snyk:
https://app.snyk.io/org/nodeshift-agg/project/01e7a606-c646-4a2f-9f1a-2f3f3000dcf6?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -56,7 +56,7 @@
     "supertest": "^4.0.0",
     "tap-spec": "~5.0.0",
     "tape": "~4.13.0",
-    "xo": "~0.28.0"
+    "xo": "~0.28.1"
   },
   "dependencies": {
     "overload-protection": "~1.2.0"