Merge pull request #5 from palashmon/greenkeeper/xo-0.24.0

Update xo to the latest version 🚀

Author: palashmon

package.json

@@ -32,6 +32,6 @@
 	"devDependencies": {
 		"ava": "^1.0.1",
 		"nyc": "^12.0.2",
-		"xo": "^0.23.0"
+		"xo": "^0.24.0"
 	}
 }