Bump xo from 0.28.0 to 0.28.1 (#68)

Bumps [xo](https://github.com/xojs/xo) from 0.28.0 to 0.28.1.
- [Release notes](https://github.com/xojs/xo/releases)
- [Commits](xojs/xo@v0.28.0...v0.28.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -34,7 +34,7 @@
     "coveralls": "^3.0.11",
     "eslint-plugin-jsdoc": "^22.1.0",
     "nyc": "^15.0.0",
-    "xo": "^0.28.0"
+    "xo": "^0.28.1"
   },
   "preferGlobal": true,
   "bin": {