Bump xo from 0.29.1 to 0.30.0

Bumps [xo](https://github.com/xojs/xo) from 0.29.1 to 0.30.0.
- [Release notes](https://github.com/xojs/xo/releases)
- [Commits](xojs/xo@v0.29.1...v0.30.0)

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

package.json

@@ -47,7 +47,7 @@
   },
   "devDependencies": {
     "coveralls": "^3.1.0",
-    "xo": "^0.29.1",
+    "xo": "^0.30.0",
     "istanbul": "^1.1.0-alpha.1",
     "mocha": "^7.1.1"
   },