Update dev-dependencies

Author: wooorm

package.json

@@ -43,7 +43,7 @@
     "tape": "^5.0.0",
     "tinyify": "^3.0.0",
     "unist-builder": "^2.0.0",
-    "xo": "^0.35.0"
+    "xo": "^0.38.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",