chore(deps): update dependency xo to v0.25.3

Author: renovate-bot

package.json

@@ -44,7 +44,7 @@
     "husky": "0.14.3",
     "lint-staged": "4.3.0",
     "prettier": "1.18.2",
-    "xo": "0.18.2"
+    "xo": "0.25.3"
   },
   "bin": {
     "pokemon": "bin/pokemon.js"