Update dev-dependencies

Author: wooorm

package.json

@@ -46,7 +46,7 @@
     "tape": "^4.0.0",
     "unist-builder": "^2.0.0",
     "xastscript": "^1.0.0",
-    "xo": "^0.25.0"
+    "xo": "^0.27.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier --write \"**/*.js\" && xo --fix",