Update NPM test script

- Removed `jest --clearCache` as the issue of Jest stucks on await dynamic
imports seems to be fixed.
- Disabled Node experimental warnings.

Author: iamWing

package.json

@@ -2,13 +2,12 @@
   "name": "electron-react-typescript-webpack-boilerplate",
   "version": "4.1.2",
   "description": "Pre-configured boilerplate for Electron + React + TypeScript",
-  "type": "module",
   "main": "./dist/main.bundle.js",
   "scripts": {
     "start": "electron ./dist/main.bundle.js",
     "dev": "rimraf dist && cross-env NODE_ENV=development webpack --watch --progress --color",
     "prod": "rimraf dist && cross-env NODE_ENV=production webpack --progress --color",
-    "test": "jest --clearCache && cross-env NODE_ENV=test NODE_OPTIONS=--experimental-vm-modules jest",
+    "test": "cross-env NODE_ENV=test NODE_OPTIONS=--experimental-vm-modules NODE_NO_WARNINGS=1 jest",
     "watch-test": "npm run test -- --watchAll",
     "next-rc": "npm --no-git-tag-version version prerelease --preid=rc",
     "next-patch": "npm --no-git-tag-version version patch",