refactor: removed redundant xo config

Author: mfranzke

package.json

@@ -68,12 +68,5 @@
     "xo": "^1.1.1"
   },
   "source": "src/index.js",
-  "umd:main": "dist/index.umd.js",
-  "xo": {
-    "space": 2,
-    "rules": {
-      "unicorn/prefer-module": "off",
-      "unicorn/prefer-node-protocol": "off"
-    }
-  }
+  "umd:main": "dist/index.umd.js"
 }