fix: revert the change in the pre-install hook

do not force using pnpm

re #365

Author: bubkoo

package.json

@@ -23,7 +23,6 @@
     "svg"
   ],
   "scripts": {
-    "preinstall": "npx only-allow pnpm",
     "lint": "eslint 'src/**/*.{js,ts}?(x)' --fix",
     "clean": "rimraf dist es lib",
     "build:esm": "tsc --module esnext --target es2017 --outDir ./es",