fix(close #5): missing dist files in npm package (#11)

Author: phatpham9

package.json

@@ -9,9 +9,6 @@
   "repository": "https://github.com/boringcodes/utils.git",
   "main": "index.js",
   "typings": "index.d.ts",
-  "files": [
-    "dist/*"
-  ],
   "scripts": {
     "clean": "rm -rf dist",
     "purge": "rm -rf node_modules",