⬆️ deps: Upgrade dependency xo to v1.

Author: renovate[bot]

package.json

@@ -102,7 +102,7 @@
     "power-assert": "1.6.1",
     "regenerator-runtime": "0.14.1",
     "total-order": "4.0.1",
-    "xo": "0.60.0"
+    "xo": "1.0.4"
   },
   "ava": {
     "files": [