remove superuser requirement

The entire library already uses sudo to execute ufw commands, so it's
perfectly fine to let the Node process run as a non-root user and manage
permissions with sudoers on Linux hosts (all I care about).

src/Index.ts

@@ -1,9 +1,5 @@
 import { checkSudo, checkNodeVersion, checkPlatform, checkPlatformExact } from './Util';
 
-if (!checkSudo()) {
-  throw new Error("You need to be root to run this package.");
-};
-
 if (!checkNodeVersion()) {
   throw new Error(`The Node version must be at least v14 or above.`);
 };