chore(deps): update dependency xo to v0.30.0

Author: renovate-bot

package.json

@@ -28,7 +28,7 @@
   "devDependencies": {
     "bundlesize": "0.18.0",
     "eslint-config-prettier": "6.5.0",
-    "xo": "0.25.3"
+    "xo": "0.30.0"
   },
   "xo": {
     "extends": [