feat: add { dir: string } option for helper exports

Starting from now, instead of `modifyPackageJsonFile('./package.json', {})` you can write `modifyPackageJsonFile({ dir: '.' }, {})

Author: zardoy

.xo-config.js

@@ -0,0 +1 @@
+module.exports = require('@zardoy/xo-config')()

package.json

@@ -35,12 +35,14 @@
         "@types/node": "^15.14.9",
         "@types/parse-json": "^4.0.0",
         "@zardoy/tsconfig": "^1.2.2",
+        "@zardoy/xo-config": "^0.1.0",
         "jest": "^27.2.0",
         "load-json-file": "^6.2.0",
         "nanoid": "^3.1.25",
         "ts-jest": "^27.0.5",
         "tsd": "^0.17.0",
-        "typescript": "^4.4.3"
+        "typescript": "^4.4.3",
+        "xo": "^0.44.0"
     },
     "dependencies": {
         "detect-indent": "^6.1.0",